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1999 Vol. 21, No. 2

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THE MESOZOIC FORELAND BASINS IN THE LOWER YANGTZE AREA
YAN Jizhu, YU Kai, ZHAO Shubai, YAO Baiping, LU Huafu
1999, 21(2): 95-99. doi: 10.11781/sysydz199902095
Abstract(737) PDF-CN(477)
Abstract:
Based on seismic sections,wells and surface surveys,the authors concluded that there exist opposite thrusting peripheral foreland basin in the middle and a single thrusting foreland basin in the south of the Lower Yangtze area in the Middle Mesozoic era(about 240～157Ma).The peripheral foreland basin is the product of A-type subduction resulted from the collision between the Lower Yangtze plate and the North China plate about 240～157Ma.The thrusting structures showed that thrust was from northwest to southeast and from southeast to northwest and the Mid-Upper Triassic and Mid-Lower Jurassic were deposited in the thrusting syncline cores;The south foreland basin is only the front part of South China basins which were resulted from the nappes thrusting from southeast to northwest and the Upper Triassic was depositted in the front of the nappes about 240～157Ma.The thrusting cores of the peripheral foreland basin is the most favourable area for seeking oil and gas traps of marine Meso-Paleozoic group.
APPLICATION OF SEQUENCE STRATIGRAPHY TO THE STUDY OF DIAGENESIS OF SILICICLASTIC ROCK—Take the Lower Tertiary of Ya13-1 gas field as an example
Lu Yongchao, XIANG Caifu, CHEN ping, YE Hongbo
1999, 21(2): 100-103. doi: 10.11781/sysydz199902100
Abstract(616) PDF-CN(389)
Abstract:
On the basis of comprehensive study of the single well section and the sequence analysis of the link-well seismic cross-section in Ya13-1 gas field in QDN basin,South China Sea,this paper analyzed the sedimentary and diagenetic marks of various system tracts by combining the sedimentary process analysis and the diagenesis analysis of the system tracts in the sequence.On the unit of the third-class sequence diagenetic environment,including reservoir-forming backgroud surroundings and the origin water chemistry of the reservoir,it summed up the diagenetic unit model of the lower Tertiary Yacheng Fm and Lingshui Fm which are comparable to the system tracts.It also inquired into the interact relation between the sedimentary system tracts and the diagenesis and its influences on the sandstones reservoirs.
DISCUSSION ON SOME QUESTIONS IN THE APPLICATION OF CONTINENTAL SEQUENCE STRATIGRAPHY
YOU Jun, ZHENG Junmao, WANG Defa
1999, 21(2): 104-109. doi: 10.11781/sysydz199902104
Abstract(649) PDF-CN(422)
Abstract:
Sequence Stratigraphy presents a concept of isochronostratigraphic correlation,that is,stratigraphic correlation under an isochronous framework.This makes stratigraphic correlation have more practical geological meanings.With the introduction of Sequence Stratigraphy into the study of continental sedimentary basins,some controversial questions arose in our country.Aimed at promoting the development of continental Sequence Stratigraphy in China,this paper gives a helpful discussion on the adaptability of Sequence Stratigraphy theory in the study of continental sedimentary basins,the genesis of continental sequences,the specific methods of research etc.
SEQUENCE STRATIGRAPHY STUDY OF CARBONATE SLOPE DEPOSIT
QIN Jianxiong, ZENG Yongfu, CHEN Hongde, TIAN Jingchun
1999, 21(2): 110-118. doi: 10.11781/sysydz199902110
Abstract(574) PDF-CN(448)
Abstract:
Study on the Permian Sequence Stratigraphy of the Youjiang Basin reveals that gravity flow develops during every period of eustatic cycles and it displays individual characteristic internal configuration and genetic framework of sequences.Lowstand is characterized by basin margin-downslope miscellaneous lithic turbidites,and gravity flow is relatively less in shelf marginal systems.During transgressive periods,gravity flow is dominated by calcarenaceous clastic flow and its recomposed sand deposit.The deposit of gravity flow in highstand has large thickness,wide distribution and rich genetic patterns,and is mainly characterized by well-developed calcarenaceous colluvial rocks,grain flow,liquefied sediment flow,clastic flow,and turbidity flow.
SEDIMENTARY SEQUENCE CHARACTERISTICS AND FAVORABLE RESERVOIR FACIES—TRACT PREDICTION FOR THE PENGLAIZHEN FORMATION OF WEST SICHUAN AND ADJACENT AREAS
HE Li, LIU Meiqing, HE Zhiguo, ZHOU Zhijun, ZHANG Shubin
1999, 21(2): 119-127. doi: 10.11781/sysydz199902119
Abstract(528) PDF-CN(391)
Abstract:
The Penglaizhen Formation in West Sichuan and adjacent areas is thick over 950-1600m,which was deposited during the wilting period of the Jurassic lake basins.Based on the combined demarcation of sequence interfaces and maximum transgressive interfaces,Ⅲ3 and Ⅲ4 two sets of sedimentary sequences are classified.By analyzing on the cycles of sedimentary base levels,the sedimentary facies types and apace-time distributive characteristics of the Penglaizhen Formation are discussed,the favorable facies tracts are predicted,and the favorable hydrocarbon-enriched blocks are classified.
SIMPLE ANALYSIS ON THE EFFECTIVENESS OF THE MIDDLE AND LATE　YANSHANIAN TECTONIC TRAPS IN THE WEST SICHUAN DEPRESSION
YUE Dongming, WANG Xin
1999, 21(2): 128-131. doi: 10.11781/sysydz199902128
Abstract(573) PDF-CN(393)
Abstract:
The tight sandstone tracts of the West Sichuan Depression are rich in natural gas resources.Exploration reveals that there are 16 sets of gas-bearing assemblages composed of 40 gas layers in K1-T3x2 formations at the depth from 200m to 4500m.The gas layers are scattered and overlapped,and connect into zones.Their space distribution shows the key effect of the Middle and Late Yanshanian tectonics.As the Middle and Late Yanshanian periods were peak time of gas generation from major hydrocarbon source rock in the West Sichuan Depression and most sandstone reservoirs had not been compacted yet and still remained in the porous stage with effective accumulation,main hydrocarbon accumulation belts formed along the normal tectonic belts at that time.Therefore,the research of the Middle and Late Yanshanian tectonic traps should be reinforced in the course of exploration in the West Sichuan Depression.
THE GEOLOGICAL STRUCTURE, FORMATION OF PETROLEUM POOLS AND　HYDROCARBON EXPLORATION IN LUNNAN-AKEKULE AREA OF THE TARIM BASIN
FAN Xiaolin, QIU Yunyu, BAO Xinyi
1999, 21(2): 132-136. doi: 10.11781/sysydz199902132
Abstract(585) PDF-CN(377)
Abstract:
Based on study of seismic-geological sections,well data and analysis of organic geochemistry of formation water in Lunnan-Akekule area of the Tarim Basin,the geological structure and formation of hydrocarbon pools were indicated.Combining with development history of basinal tectonics,it was pointed out that there were several periods of formation of hydrocarbon pools in the area.Then the seal conditions after accumulation of hydrocarbon were discussed.The authors suggested that petroleum exploration in the area should consider the unconformity-related Paleozoic(Ordovician,Carboniferous)non-anticline traps and the Triassic traps in drape structures.
EFFECTIVENESS OF NATURAL GAS SEALS IN THE WESTERN PART OF THE　SOUTHERN FRINGE OF THE JUNGGAR BASIN
FANG Dequan, SONG Yan, XIA Xinyu
1999, 21(2): 138-140. doi: 10.11781/sysydz199902138
Abstract(495) PDF-CN(351)
Abstract:
Based on the restoration of the paleo-burial history and paleo-anormalous pressure of natural gas seals,the effectiveness of natural gas seals in western part of the southern fringe of the Junggar Basin has been evaluated combined with the hydrocarbon-generating and hydrocarbon-discharging time of major source rock.It is considered that the Anjihaihe Formation is the effective caprock for the Jurassic source rock,and the Sangonghe Formation and the Baijiantan Formations are effective for the Middle Permian one.
DYNAMIC VARIATION OF RESERVOIR IN WATERFLOODING DEVELOPMENT IN NO.12 FAULT BLOCK, HUZHUANGJI OILFIELD
CHEN Ling, WU Shenghe, LIU Yuhong
1999, 21(2): 142-145. doi: 10.11781/sysydz199902142
Abstract(495) PDF-CN(382)
Abstract:
Reservoir properties have greatly changed in No.12 fault-block,Huzhuangji oilfield after the oilfield has been developed by waterflooding for about ten years.In this paper,two adjacent cored wells(Hu12-20 and HJ1),drilled at the pre-and post-waterflooding,are selected as "research window".Dynamic variation of reservoir is explained from the view of point of reservoir physical properties,intraformational and interlayer heterogeneities and reservoir micropore structure,which will provide important geological basis for improving oilfield development effect.
THE CALCULATION AND REPRESENTATIVE ANALYSIS OF PERMEABILITY HETEROGENEOUS PARAMETERS
YIN Shoupeng
1999, 21(2): 147-149. doi: 10.11781/sysydz199902147
Abstract(618) PDF-CN(612)
Abstract:
Permeability is one of the most important parameters affecting reservoir physcical properties.This paper,based on the study of reservoir heterogeneity parameters home and abroad,gave a systematic analysis of various heterogeneous parameters,including the plane distribution features,probability distribution characteristics,calculation and comparison of different average values,rational selection and utilization of parameters,analysis of representative,characterization of parameters,and geological factors affecting the calculation of parameters,in order to provide practical permeability parameters in the course of reservoir simulation and the calcuation of oil and gas reserves.
CHARACTERISTICS AND FORMATION CONDITIONS OF HYDROGEN-RICH COAL IN FUSHUN BASIN
ZHUANG Xinguo, LI Sitian, WANG Shenwei
1999, 21(2): 151-155. doi: 10.11781/sysydz199902151
Abstract(949) PDF-CN(577)
Abstract:
On the base of systematic field works and analysis of test in laboratory,this study summarized characteristics of petrography,organic geochemistry and hydro-liquefaction of hydrogen-rich coal in Fushun Basin,and made an inquiry into formation conditions of hydrogen-rich coal.The lithofacies types of Fushun coal are very abundant.19 types of lithofacies have been identified in terms of macroscopic petrographic composition and structural type of Fushun coal.The maceral of Fushun coal is generally characterized by high vitrinite and low inertinite and exinite contents,but in some special lithotypes,for example,amber coal and humic-sapropelic coal,the former contains abundant resinite and the latter is mainly composed of fragmental vitrinite and high degraded filamentous algae.The rank of Fushun coal is mainly subbituminous and high volatile abituminous.Fushun coal is of good liquefaction quality and relatively-excellent liquefaction coal.Fushun coal was formed in a warm and humid forest swamp with deep overlying water and rich resin,and a tectonic condition of rapid subsidence.
STUDY ON THE APPLICATION OF THE NEURAL NETWORK EXPERT SYSTEM TO THE PREDICTION OF DAILY OUTPUT PER WELL
PENG Dunlu, XU Shijin, WANG Rucheng, GUO Yangjun
1999, 21(2): 156-160. doi: 10.11781/sysydz199902156
Abstract(645) PDF-CN(339)
Abstract:
This paper gives an overall discussion on the Neural Network Expert System and its development steps.Taking the reservoir and crude oil parameters and daily output per well for 10 available oil wells in Shengli-Fanjia oil field for example,the Neural Network Expert System developed has been used successfully to predict the daily output per well of two forecasting wells.Therefore,the Neural Network Expert System can overcome the defects of conventional statistical method and fuzzy method who are unable to correctly determine the subordination degree and jurisdiction distribution of each parameter.It is also pointed out that the oil field prediction by the Neural Network Expert System is accurate,rapid and effective.
A METHODOLOGICAL APPROACH FOR RESERVOIR HETEROGENEITY CHAR ACTERIZATION OF QIULIN OIL FIELD USING ARTIFICAL NEURAL NETWORKS
XIE Congjiao, GUAN Zhenliang
1999, 21(2): 161-165. doi: 10.11781/sysydz199902161
Abstract(500) PDF-CN(263)
Abstract:
Porosity and permeability are the best show of reservoir heterogeneity which is because of the heterogeneity and nonliner spatical distribution of the rocks.In recent years,there is a wide application of ANN in reservoir description and more application can be found in using ANN to choose exact reservoir model for well test.This paper suggested an ANN-way to descripe reservoir heterogeneity and to build a rather reliable interpretation model of porosity and permeability.Also,by this way,a study was done to reservoir physical properties in Sanjianfang Formation,Qiulingoil field.
APPLICATION OF ARTIFICIAL NEURAL NETWORKS TO RESERVOIR DESCRIPTION
QIU Liwei, KANG Zhijiang
1999, 21(2): 166-169. doi: 10.11781/sysydz199902166
Abstract(563) PDF-CN(321)
Abstract:
The normal logging explaination methods based on experience formulas and the linear hypothesis show lower accuracy and successful rate.The artificial neural networks technique can adapt itself,learn itself.It has well prospect in logging explaination.This paper provides a case to illustrate the advantage of the artificial neural network technique in logging porosity explaination.
APPLICATION OF FUZZY CLASSIFICATION METHOD BASED ON GENETIC ALGORITHM TO THE IDENTIFICATION OF CRUDE OIL NATURE
CHEN Feng, HU Shangxu, YU Menhuai
1999, 21(2): 170-174. doi: 10.11781/sysydz199902170
Abstract(553) PDF-CN(410)
Abstract:
In this paper,Fuzzy Pattern Classification Method based on Genetic Algorithm(GA)is proposed.It's used to the identification of crude oil nature in the Tarim Basin.The clustering center and weight vector are determined with GA and the degree of compatibility of every crude oil sample is determined too.The results of classification for 20 specimen indicated that the performance of this method is good,and it might be referred as an assissant technique to the identification of crude oil nature.
STUDY ON THE THERMAL SIMULATION EXPERIMENT OF D-BACTERIODECOMPOSED AMORPHOUS SOLID AND B-MICRINITE
DING Anna, XIA Yanqing, TUO Jincai, HUI Rongyao
1999, 21(2): 175-179. doi: 10.11781/sysydz199902175
Abstract(611) PDF-CN(238)
Abstract:
By the method of the Rapid Thermal Simulation Experiment,kerogen samples with the D-bacteriodecomposed amorphous solid and B-micrinite contents of 76.50%－93.88% are conducted the experiment.And their hydrocarbon-generating mechanism of thermal evolution and their contribution to hydrocarbon formation are discussed in particular.Experimental results reveal that D-bacteriodecomposed amorphous solid has higher liquid-hydrocarbon producibility and B-micrinite has maximum gas-hydrocarbon producibility.The peak period of hydrocarbon generation for all the experimental samples occurs at the R0 value of 0.70%-1.00%,and the peak period of gas-hydrocarbon generation slightly lags with the R0 value of 0.80%-1.00%.As the hydrocarbon components include C1－C17,hacteriodecomposed amorphous solid and B-micrinite are some major macerals to form natural gas and condensate.
STUDY ON THE THERMAL EVOLUTION OF OIL SOURCE ROCKS IN THE JINHU DEPRESSION OF NORTH JIANGSU PROVINCE
LU Dongsheng, XUE Jianhua
1999, 21(2): 180-183. doi: 10.11781/sysydz199902180
Abstract(574) PDF-CN(252)
Abstract:
The Stratigraphic Compaction Correlation Method is used in this paper to restore the burial history of strata and oil source rocks for different blocks of the Jinhu Depression.According to the relationship of vitrinite reflectance to paleo-geotemperature,the paleo-geotemperature and paleo-geothermal gradient of the Depression are restored,and the TTI value of oil source rocks during each period of geohistory is calculated.On the basis of above method research,the geotemperature-geological model for the thermal evolution of oil source rocks is established,and the evolutionary and hydrocarbon-generating stages and oil-generating thresholds for Fu-2 and Fu-4 two sets of oil source rocks in the Jinhu Depression during the period of geohistory is classified.
ANALYSIS OF WHIRL THIN LAYER CHROMATOGRAPHY FOR GROUP COMPOSITION OF CRUDE OIL AND SOURCE ROCKS
BIE Daozhe, CAO Jiangping, ZHEN Lunju
1999, 21(2): 185-187. doi: 10.11781/sysydz199902185
Abstract(509) PDF-CN(427)
Abstract:
The whirl thin layer chromatography is a quick and effective method for separation of group composition of crude oil and chloroform bitumen "A" of source rocks in separation and purification of organic compound.It is characterized by smaller sample,higher recovery rate,better separation and easier separation comparing with the classic column chromatography.It will be widely applied in some fields.

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