石油实验地质

OIL INJECTION AND BASIN STUDY OF FHE JURASSIC IN EASTERN JIUQUAN BASIN

Xu Wang

1994, 16(2): 103-118. doi: 10.11781/sysydz199402103

Abstract(545) PDF-CN(464)

Abstract:
The geologic features of eastern Jiuquan Basin such as the tectonic setting and evolu-tion,formative age of basin,the occurrence of source rocks are similar to those of westernJiuquan Basin.However,most faults in the eastern Jiuquan Basin do not reach the Zhong-gou Formation and Tertiary due to an earlier cease of faulting activities.Therefore no Ter-tiary secondary oil pool has been discovered in E.Jiuquan Basin,although it is favourablefor the preservation of deep Jurassic-Cretaceous oil/gas pools.Because Changsha Lingstructural belt in the basin is an"uplift within depression",the conditions for oil/gas accu-mulation are very favourable.Further to the west,it is believed that more attentionshould be paid to the occurrence of the buried-hill oil /gas pools on the dipping slope ofWen Shushan embossment.Oil injection from the Jurassic of the Jiusheng No.1 well re-minds us of the importance to re-evaluate oil/gas prospect of the Jurassic in the Corridorarea.

THE STUDY ON THE ORGANIC GEOCHEMISTRY OF ISOMETAMORPHIC COAL AND VITRINITE—ROCK—EVAL PYROLYTIC ANALYSES

Zhang Xiaodong, Liu Guangding, Wang Jialin

1994, 16(2): 119-127. doi: 10.11781/sysydz199402119

Abstract(1438) PDF-CN(440)

Abstract:
In this paper,detailed Rock-Eval pyrolyses have been carried out on the vitrinite and composition of various reductional- type coals(i.e.coal facies Ⅱ andⅢ)from the Northern Jiangsu and Southern Shandong provinces of the southern part of North China,and their geochemical features are also studied combining with anthracological identification and the measurement of fluorescent parameters.The above studies suggest the following three comments:1)the pyrolytic analysis could be an effective means for the potential evaluation on coal-derived hydrocarbon,2)the type of vitrinite should play a signigicant influence on the hydrocarbon poteintial derived from humic coal,in which rich hydrogen- bearing vit-rinites are the major contributors to hydrocarbon generation,3)exinoid compositions should also be the contributor to the hydrocarbon generation from humic coal,and 4)the rich hydrocarbon-bearing coal with coal facies Ⅱ and Ⅲin the study areas should be a cer-tain type of humic coal which essentially consists of fluorescence vitrinite and exinoid com-positions.

PRELIMINARY STUDY ON THE DEEP GEOLOGICAL STRUCTURE IN THE XUEFENG AREA(THE JIANGKOU—DONGKOU SECTION)

Fan Xiaolin, Jiang Xingge, Jiang Hongkan, Lu Guoxing

1994, 16(2): 128-135. doi: 10.11781/sysydz199402128

Abstract(616) PDF-CN(313)

Abstract:
In accordance with the data of deep seismic sounding,MT sectional structure,gravitymodel of the continental crust in the Xuefeng Area,as well as the interactive comprehen-sive interpretation and understanding of the field observations in the area,a series of mapsconcerning about the geometry of deep crustal structures and median rocks are preliminari-ly compiled in this paper.It is concluded as:(1)The Proterozoic underplating"drifted"micro-continental blocks(or sea mounts),and tectonomagmatic(metamorphic)dikeswarms formed under Palaeozoic collision and epeirogeny,and ductile(or brittle)pyroliticmasses accompanied with the Meso-Cenozoic intracontinental subduction must be occurredin the area.(2)Both the Paleozoic"mildly sutured"structure and the Meso-Cenozoic"in-tra-crustal squeeze"which were dominated by two different dynamic systems must havetaken place.(3)A group of deep-shallow thrusting sheets and asymmetric deformationfan-tectosomes is a key tectonic(division)domain in S.China orogenic zone.

RESERVOIR CHARACTERISTICS OF THE ORDOVICIAN WEATHERING CRUST AND SECTIONAL STRUCTURE IN ORDOS NO.7 WELL, THE ORDOS BASIN

Liu Changchun

1994, 16(2): 137-143. doi: 10.11781/sysydz199402137

Abstract(457) PDF-CN(221)

Abstract:
The Ordovician weathering crust in the area of No.7 drill well can be divided intothree karst beIts in the Ordos Basin,namely vertical,horizontal,and deep karst belts,Theinhomogeneity of reservoirs in the weathering crust is dominantly controlled by karstifica-tion and the karst porous belt in the weathering crust is rated as the major reservoir bedsof natural gas,Based on the characteristic study of each karst belt,No.7 drill well is locat-ed in the lower part of the Caledonian palaeo-karstificated slope,toward the west whereOrdos No,5 and No.8 wells are positioned could be more promising prospects for oil/gas.

THE CHARACTERS OF THE DEPOSITIONAL SYSTEMS AND SEQUENCE STRATIGRAPHY OF THE DEEP FAULTDOWN DEPRESSION IN THE LISHU DEPRESSION OF THE SONGLIAO BASIN

Xie Xinong

1994, 16(2): 144-151. doi: 10.11781/sysydz199402144

Abstract(880) PDF-CN(402)

Abstract:
The Lishu Depression of the Songliao Basin can be divided into a faultdown depressionstructural sequence in the lower part and a depression structural sequence in the upperpart.The faultdown depression structural sequence could consist of four sub-sequences ofthe lower and middle parts of the Shahezi Formation,the Yingcheng Formation and theDeng louku Formation.In lower part of deep faultdown depression,the alluvial fan-fandelta system,delta system and lacustrine system are widespreaded,of which lacustrinesedimentary system takes a large proportion and could be considered as the main sourcerocks of hydrocarbons in the Lishu Depression,while the plaiting plains-type fan delta sandmassif and delta sand massif could be the main reservoirs in deep faultdown depression.This paper describes the stratigraphic sequence and petroliferous characters of deep fault-down depression based on the geological studies of the depositional systems and the forma-tion of sedimentary sequences.

RESERVOIR EVALUATION AND PETROLEUM RESERVE ESTIMATION BY MULTIPLE WELL—LOGGINGS

Jin Qiang, Wang Weifeng, Xin Quanlin

1994, 16(2): 152-156. doi: 10.11781/sysydz199402152

Abstract(593) PDF-CN(466)

Abstract:
The reservoir evaluation technology multiple well-loggings in oil pool description can provide a great number of reservoir parameters,By predicting on the inter-well loggingparameters of reservoir,the three-dimensional data base of reservoir could be established.Such a data base can effectively reveal the anisotropism of reservoir and the distributivepattern of petroleum,and it reaches very high precision which has been proven by oil pro-ductional tests.Using this data base and the isogram of reservoir parameters to do the es-timation of hydrocarbon reserve would be more precise than using traditional method;fur-thermore,artificial errors can also be avoided as much as possible.

A PREDICTION ON THE FAVOURABLE OIL—BEARING PLAYS IN THE FUYU RESERVOIR OF THE SONGLIAO BASIN BY THE APPLICATION OF CHARACTERISTIC ANALYSIS

Guo Shaobin, Liu Zhaojun, Liu Wanzhu, Yang Guang

1994, 16(2): 157-163. doi: 10.11781/sysydz199402157

Abstract(573) PDF-CN(374)

Abstract:
Applying characteristic analysis,the authors of this paper set up an optimum mod- elling formula of the Fuyu oil reservoir from the study areas of the Xinmin and Fuyu Oil-fields in the Songliao Basin。In this modelling formula seven significant geological vari- ables are selected with various weighed coefficients.According to the value of weighedcoefficients,it is revealed that oil/gas accumulation should be predominantly controlledby the distance from oil-generating center of depression to the accumulation,hydrocar-bon expulsion of the lst section of the Qingshankou Gr.(Fr.)and sedimentary facies inplace rather than other factors.Combined with physical analysis,it is believed that thebest oil/gas prospects in the Fuyu oil reservoirto be located in the Longhupao-Daan ter-race,of which the south area is in the central south of the Huazijing terrace and thewestern clinoform zone of Fu-Xin uplift.

FACTOR ANALYSIS ON THE PORE TESTURE OF THE TIGHT SANDSTONES IN THE LONGTAN FORMATION(JIANGSU)

Wang Wenyao, Cao Jiayu, Guo Guang, Qiu Qifu

1994, 16(2): 164-171. doi: 10.11781/sysydz199402164

Abstract(529) PDF-CN(351)

Abstract:
The clastic type of tight sandstones is dominantly made up by feldspathic lithic quart-zose sandstone with fine grain size rather than feldspathic litharenite,As for fine-micro-throat tight sandstones,samples with value of Φ fewer than 5% occupy 63%of the total,those with value of K fewer than 0.1×10^-3μm occupy 78%,and the value of R_M is 0.007to 0.472μm,A part of porous parameters have good correlations among themselves,butthey have no correlation to the parameters of conventional physical property or even far.With the assistance of R-factorQ-factor analysis,we select the parameters to evaluatethe quality of pore structure,and set the standard with the value of R_M more than 0.15μmand the value of C fewer than 0.45 to ascertain(poor)reservoir rocks.The(poor)reser-voir rocks are mainly medium-grained and partly fine-grained quartzose sandstone of in- creased interstice─feldspathic solution opening,and generally have fair-level oil showswhich are common in Zhenjiang Coal Mine and Yixing Chuanbu region,Therefore it is be-lieved these two areas should be good prospecting targets for exploration.

THE RESEARCH METHOD AND ITS GEOLOGICAL SIGNIFICANCE OF MICROPOROUS GEOMETRY IN THE CAPPING—BEDS OF NATURAL GAS

Zhu Panliang, Zhang Wenda, Chen Weijun, Jin Juchang

1994, 16(2): 172-179. doi: 10.11781/sysydz199402172

Abstract(509) PDF-CN(423)

Abstract:
On the basis of the principles of existance of adsorption and condensation on the sur-face of micropores,the authors obtain the adsorption and desorption isotherms of microp-orosity through the measurements by using the ST-03 type specific surface pore diame-ter.By use of their geometry and the research results of adsorbed capacity of microporosi-ty,they decide the microporous geometry in the capping-beds of natural gas and make adistinction between pores and cracks in order to lay foundation for studying the primaryand post-primary migrations of oil and gas.

ON THE ORGANIC MATURITY OF THE ORDOVICIAN SYSTEM IN THE NORTHERN SECTION OF THE WESTERN MARGIN OF THE ORDOS BASIN BY USING CONODONT COLOR—ALTERED INDEX

Yu Fenling

1994, 16(2): 180-184. doi: 10.11781/sysydz199402180

Abstract(533) PDF-CN(309)

Abstract:
In this paper,conodont color-altered index(CAI)is applied to the studies of the or-ganic maturity in the Ordovician system of the two structural units on the northern section of the western margin of the Ordors Basin.It is suggested that the value of CAI be 3 to 3.5 in the basin with paleogeotemperature of 115 to 140℃,and the evolutionary stage of organic matter can be attributed to mature to high-mature;while the value of CAI be 1.5 in the Tonggelagao fault block in overthrusting zone with a paleogeotemperature of 43℃,and the evolutionary stage of organic matter remains unmature.Moreover,the author of this paper questions the validity of the statement that the Tonggelagao fault block is formed by Yanshanian movement according to paleobiological and CAI reference.

TO DISCUSS THE AMOUNT OF INDICATORS USED IN THE WATER CHEMICAL ANALYSIS OF CHLORIDE ION

You Gexin, Hang Yiping

1994, 16(2): 185-187. doi: 10.11781/sysydz199402185

Abstract(465) PDF-CN(265)

Abstract:
For various analytical methods,if there is somewhere unstrict,the analytical work cannot go smoothly,even can be led to errors.In view of the analytical methods of chlo-ride ions in water,this paper discusses theoretically and practically the amount of the indi-cator added.

AN APPROACH TO THE CONODONTS FROM XIAOSHIGAI SECTION AT THE BOUNDARY BETWEEN THE CAMBRIAN—ORDOVICIAN SYSTEMS, XIAOSHAN, ZHEJIANG PROVINCE

Ding Liansheng

1994, 16(2): 188-195. doi: 10.11781/sysydz199402188

Abstract(555) PDF-CN(248)

Abstract:
Conodonts discovered from Xiaoshigai section at the boundary between the Cambrian-Ordovician systems of Xiaoshan Region,Zhejiang Province are used to establish 4 con-odont fossil zones.The boundary bed is located between No.2 and No.3 zones,suggesting it is 30.7m upward than that of previously defined.It is considered that those fossil zones are comparable to the conodont zones of the corresponding beds at home,as well as consis-tent with the boundary decided by the International Work Group for the Cambrian-Or-dovician Boundary.Moreover,the color indexes of conodonts and their relationship with oil and gas are also discussed in the paper.

1994 Vol. 16, No. 2

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