石油实验地质

1993, 15(3): 224-224. doi: 10.11781/sysydz199303224

Abstract(524) PDF-CN(307)

Abstract:

SEISMIC FACIES MODELS OF THE QAIDAM BASIN

Wang Mingru

1993, 15(3): 225-234. doi: 10.11781/sysydz199303225

Abstract(614) PDF-CN(359)

Abstract:
Seismic facies models are established for the areas of klint,slope and lake centre in the Qaidam Basin based on their subaqueous topography and morphology,the former two prevailed by the sediments of dalta,alluvial fan,subaqueous fan,channel sand body,river mouth bar and sand bodies,are favourable hydrocarbon reservoirs,while argillaceous source rocks are predominantly developed in the latter. On the basis mentioned above,the author has established the distributive models for the seismic facies of four stages(early,middle,late and end)in the Qaidam Basin,illustrating the distribution patterns of reservoirs and source rocks during various stages of the basin evolution,and it provides scientific basis for the planning of petroleum exploration in the basin.

THE GEOLOGICAL—GEOPHYSICAL FIELD PROPERTIES OF THE HUAINAN SYNCLINORIUM AREA AND THE COAL/COAL DERIVED GAS PROSPECTING ANALYSIS

Shen Xiuzhi, Li Xiuxin, Xue Aimin, Lin Dongyan

1993, 15(3): 235-242. doi: 10.11781/sysydz199303235

Abstract(838) PDF-CN(296)

Abstract:
The nappe structures of the Shungengshan-Bagongshan and the Minglongshan- Shangyaoshan belts developed respectively along north and south flanks of the Huainan Synclinorium. The geophysical analysis on the lithomechanics,seism and gravity in the area have suggested that the geophysical field characters coincide with the tectonic regime. Based on the above analysis,the authors of this paper established comprehensive geological-geophysical models and furthermore,proposed that the Permo-Carboniferous coal seams and the coal derived gas,especially those beneath the thrust belts are main prospecting plays for the Huainan Synclinorium and its adjacert areas.

THE BURIAL DIAGENESIS AND THE ORIGIN OF THE PORES/FRACTURES IN THE LIMESTONES OF THE QIULITAGE GROUP, CAMBRIAN—ORDOVICIAN SYSTEMS IN THE NORTHEASTERN TARIM BASIN

Tan Wenbin, Li Nanhao

1993, 15(3): 243-251. doi: 10.11781/sysydz199303243

Abstract(800) PDF-CN(214)

Abstract:
The origins of pores and fractures in the limestones reservoirs of the Qiulitage Group,the Northeastern Tarim Basin are closely related to various burial diagenesis in which the dolomitization is the key process for the limestones. Our recent researches suggest that the aplitic lozenge dolomites limited obviously by stylolites could be produced by burial-volume increasing dolomization. Among the five stages of fracturations,only the third and fifth ones matched the time with the migration of oil/gas in the area. Therefore,the space of pores and fractures could be preserved from the filling up of calcites. In addition,the type Ⅲ stylolites reworked by fracturation can be turned into effective fractures for oil/gas accumulation.

SEDIMENTARY EVOLUTION AND STRUCTURAL BACKGROUND OF THE PERMIAN SYSTEM ON THE BOUNDARY OF JIANGSU—ZHEJIANG—ANHUI PROVINCES

Zhu Hongfa, Qin Deyu, Chen Yue, Wang Shuyi, Wang Genhua

1993, 15(3): 252-261. doi: 10.11781/sysydz199303252

Abstract(602) PDF-CN(312)

Abstract:
The paper discusses the lateral and vertical sedimentary features of the Pemian System developed during the stages of Qixia,Maokou and Changxing on the boundary of Jiangsu-Zhejiang-Anhui province. It is suggested that a series of sedimentary-structural models with regularity of successive extensionally faulted troughs occurred in the Permian System of the region due to the expansion of Paleo-Tethys sea and the extension undergone in the interior continental crust.

PRELIMINARY STUDIES ON THE FORMATION AND THE ACCUMULATIVE REGULARITY OF THE JURASSIC SECONDARY GAS POOLS IN THE XIAOQUAN STRUCTURE

Geng Yucheng

1993, 15(3): 263-271. doi: 10.11781/sysydz199303263

Abstract(557) PDF-CN(323)

Abstract:
The Jurassic gas pools in the Xiaoquan Structure are the secondary gas pools controlled by effective reservoirs and fracture system with the source from the Xujiahe Fr. deep gas. The formative condition and the accumulative regularity are characterized by double seals with direct seal beds and regional covers,and the natural gas illustrates its wide distribution and multiple pools,consisting of a certain accumulative belt with "secondary" high abnormal pressure. The high productive gas belt is generally distributed on the high pressure zones and the gas pools have their own independent systems without edge and bottom water seals,attributed to pure gas pools.

SEDIMENTATION TYPES AND CHARACTERISTICS OF SOURCE ROCKS IN THE PALEOGENE SALT LAKE FACIES IN EASTERN CHINA

Wu Deyun, Wang Rongxin, Zhang Guofang

1993, 15(3): 272-280. doi: 10.11781/sysydz199303272

Abstract(640) PDF-CN(271)

Abstract:
The petroleum exploratory practice in Paleogene non-marine lacustrine facies,eastern China proved that the source rocks in the same salt-bearing lake basin can be classified into three sedimentation types i. e. normal,alternative,lateral variation types. Furthermore the source rocks of saline-lake facies are characterized by abundant organics,with type Ⅰ kerogen,low thermal evolution,high density of crude oil,low content of hydrocarbon,high content of non-hydrocarbon and sulfur. As for the compositions of hydrocarbons,there is a high predominance of phytanes with a series of sterane and terpane compounds rich in biological configurations and gamma cerotane. The three sedimentation types with exploration cases are analysed in detail.

DISTRIBUTIVE CHARACTERISTICS OF“FINGERPRINT”COMPOUNDS IN THE FORMATION WATER OF NORTHERN SONGLIAO BASIN, AND THEIR RELATIONSHIP TO OIL/GAS

Huang Futang, Zhang Weiqin, Zhang Guolin, Zhang Hongzhi

1993, 15(3): 281-289. doi: 10.11781/sysydz199303281

Abstract(557) PDF-CN(293)

Abstract:
The paper mainly discusses about the content and distributive characteristics of "fingerprint" compounds in the formation water of northern Daqing Basin,proposing the indices on their content in productive and non-productive formation waters.

DISCUSSION ON THE INTERFERENCE FACTORS OF NEAR SURFACE PETROLEUM GEOCHEMICAL SURVEY AND THEIR CORRELATIONS

Zhang Bailing

1993, 15(3): 290-295. doi: 10.11781/sysydz199303290

Abstract(553) PDF-CN(307)

Abstract:
The interference factors in petroleum geochemical exploration are caused by the combination of natural geographical conditions,epigenesis and anthropological activity. The reliability of geochemical exploration and its effects in geology,to a certain extent,depend on the interference factors and the level of correction on them. However,the interference factors do not occur independently. Basically,a comprehensive study on various interferences in soil medium is made in the paper. In addition,multi-dimensional corrections for them are proposed for petroleum geochemical exploration. Getting rid of the pseudomor-phes of epigenetic geochemistry,the surface geochemical field would truely reflect the trace of subsurface hydrocarbon accumulations.

APPLICATION OF FRAME FILTERING TECHNIQUE IN PETROLEUM GEOCHEMICAL EXPLORATION

Chen Li

1993, 15(3): 296-303. doi: 10.11781/sysydz199303296

Abstract(530) PDF-CN(254)

Abstract:
Traditonally one background value represents the geochemical background of a region covering thousands upon thousands square kilometres,however,it has been replaced by the technique of frame filtering. In this way a heterogeneous background field is described as a rising-falling geochemical relief surface. The technique provides a new way of technology and effective method for the identification of local weak abnormals in a low background region.

PYROLYSIS AND C—ISOTOPIC STUDY ON CARBONATES OF SURFACE SOIL

Xiang Longbin, Yang Zhanshan, Wu Pengyuan

1993, 15(3): 304-308. doi: 10.11781/sysydz199303304

Abstract(608) PDF-CN(264)

Abstract:
The surface soil sampled from Dongpu area is pyrolysed at different temperatures and isotopically analysed by C-isotopic method,and correlated with the underground geochem-ical measurements from an exploratory well. The results show that altered carbonate of soil(△C) does not directly related to vertically upward migration of hydrocardons,but to upward dissemination of mineralized water associated with the formation of hydrocarbon pools. Such a process is the cause for "alteration" of pH value of soil,therefore it may indicate the existence of hydrocarbon accumulation.

DISCUSSION ON THE GEOLOGICAL AGE OF THE XIANGSHAN GROUP IN THE ORDOS BASIN

Zhang Kang

1993, 15(3): 309-316. doi: 10.11781/sysydz199303309

Abstract(538) PDF-CN(355)

Abstract:
A pile of continental slope gravity flow sediments with olistostrom developed in the west and the southwest margins of the Ordos Basin within the middle and upper Ordvician systems. The middle Ordovician is generally referred to as the Pingliang Group while it is remained as the Xiangshan Group in Ningxia Hui Autonomous Region due to the discovery of the Cambrian fossils in the sequences. However,the author believes that the geological age of the group should be attributed to the Ordovician Period since the Cambrian fossils discovered in foreign rock fragments. Consequently,the contradiction between the strati-graphic sequence and the discovered fossils can be settlled.

1993, 15(3): 317-317. doi: 10.11781/sysydz199303317

Abstract(616) PDF-CN(248)

Abstract:

1993 Vol. 15, No. 3

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