石油实验地质

EXPERIENCES AND FUTURE OUTLOOK OF GEOLOGICAL PROSPECTING OF PETROLEUM IN CHINA

Special Correspondent

1981, 3(3): 147-154. doi: 10.11781/sysydz198103147

Abstract(470) PDF-CN(242)

Abstract:
Geological prospecting of petroleum has been carried on over the whole country since 1955 and resulted in the discovery of a series of important oil and gas fields.This paper summarizes the experience of practice which had been proved to be successful as well as some of the theoretical aspects which served as guiding principles. As a second-turn countrywide prospecting work is now being planned, some suggestions are made here with the aim of gaining still greater progress.

THE REGIONAL TECTONO—STRUCTURAL FEATURES AND TRAP TYPES IN SOUTHEASTERN SZECHUAN AND THEIR RELATIONS WITH THE DISTRIBUTION OF GAS POOLS

Tong Congquang, Zhang Liangjian

1981, 3(3): 155-165. doi: 10.11781/sysydz198103155

Abstract(449) PDF-CN(337)

Abstract:
Interpretation of Landsat images has indicated four westeastward hidden fractures and nine concealed structural traps, some of which are proved to be gas pools.There is evidence that a major hidden fracture exists below the high, steep, narrow anticlinal belt. since the late paleozoic time, as a result of the mutual subduction and collision of the Indian-Australian plate, the Asian plate and the Pacific plate, large amount of wrench series have developed within Szechuan Basin. These fracture series of horizontal displacement have involved the creeping of the low volocity beds or the upper mantles and the deep seated beds as well as the activation of the magma, resulting in strong faulting and folding and deformation of the crust. The horizontal displacements of several deep fractures that are located between Huaying Shan and Qian Jiang have given rise to large amount of torsionanticlinal traps in the sedimentary cover. At the time of the formation of these traps, the primary and secondary hydrocarbons migrated to and accumulated in these traps, while hardly any gas pools occurred in the high, steep, narrow anticlinal belt due to its poor conditions for gas preservation. Therefore the low anticlines and/or the hidden structural traps are essentially the sites for gas accumulation. The gas pools are rather dispersed both geographically and stratigrap-hically and the traps are poorly filled.

RELATIONSHIP BETWEEN THE FEATURES OF THE REGIONAL TECTONIC SYSTEM AND THE ACCUMULATION OF PETROLEUM IN SOUTHERN SZECHUAN

Zhao Congjun, Ou Zhenzhou

1981, 3(3): 166-170. doi: 10.11781/sysydz198103166

Abstract(470) PDF-CN(320)

Abstract:
Tectonic system is the main factor which controls the accumulation of petroleum, and the local structures is the important prerequisite for oil preservation. The distribution of highly productive gas fields in Southern Szechuan is controlled by the "suitable" structure which is formed by the multi-system composite.The inheritant uplift in the ancient and modern tectonic systems is disadvantageous to petroleum preservation; the composite tectonic system,which is formed on the background of inharmonic depressions and slops, is favaorable for both petroleum accumulation and preservation.

A PRELIMINARY DISCUSSION ON NAPPE STRUCTURE IN SOUTHERN JIANGSU

Zhang Chaoyan

1981, 3(3): 171-176. doi: 10.11781/sysydz198103171

Abstract(427) PDF-CN(299)

Abstract:
In this paper the nappe structure developed in southern Jiangsu is discussed.The Devonian strata rest on the Permian strata in many places of Taihu and Jiangyin areas, the paleozoic folds taking a shape of "sole"are overthrusted on the Late Jurassic volcanics in Maoshan moun-tain range, and the Pre-Cambrian strata of "Taizhou Buried Hill" are lying on the red beds of the Cretaceous.All these are evidence suggesting the multitype, multidirectional and multistage feature of the nappe structure. The nappe swarms in Taihu and Jiangyin areas are caused by the Kunjia block uplift and their roots are located approxima tely in Kunshan-Jiashan area.If the outcrops of the Devonian formation in Jingjiang and Nantong areas are also proved rootless, then the maxium displacement of the nappes will probably reach seventy five Kilometers.As nappe structures may act as barriers to oil and gas migration, their practical significance is as important as that of unconformity. In field and research work, attention should be given to identifying these allochthonous sheet-like blocks.

THE CRETACEOUS SPORO-POLLEN ASSEMBLAGE IN SONGLIAO BASIN AND ITS PETROLEUM-STRATIGRAPHICAL SIGNIFICANCE

Li Zhe, Yu Jingxian

1981, 3(3): 177-185. doi: 10.11781/sysydz198103177

Abstract(446) PDF-CN(298)

Abstract:
According to the existing data of Songliao Basin and from the aspects of petroleum geology, a discussion is made on the Cretaceous sedimentation environment of Songliao Basin and its relation with oil-bearing strata, and the formation of source material by using the dependence of sporo-pollen fossil assemblage on the Cretaceous sedimentation environment. This paper contains three parts. (1) Brief description of the strata and the sporo-pollen fossil assemblage; (2) Discussion on the paleoclimate and paleovegetation of the stage of sedimentation; (3) Variation of Cretaceous paleogeography and paleoclimate in the Songliao Basin and its relation with the formation of source ma-terial.

PRILIMINARY INVESTIGATION ON LOWER AND MIDDLE DEVONIAN CONODONTS FROM THE QINJIA COUNTY IN DEBAO DISTRICT OF GUANGXI AND THEIR SIGINIFICANCE IN INDICATING FACIES

Xiong Jianfei

1981, 3(3): 186-196. doi: 10.11781/sysydz198103186

Abstract(562) PDF-CN(314)

Abstract:
Twenty three species belonging to ten genera collected from Qinjia County in Debao District of Guangxi are described in this paper. Including three new species (Plectospathodus duowenensis;Polygnathus debaoensis and Polygnathus qinjaensis) and four uncertain species. Four zones of Polygnathus (P.dehiscens; P. perbonus; P. inversus; P. serotinus) are found and the the writer suggests that the Qinjia Formation and Debao Formation to be Lower and Middle Devonian in age. The conodonts zones are correlated with related strata of Western Europe and North America. Meanwhile, preliminary investigation on Devonian conodonts and their significance in indicating facies are discussed.

THE BASIC GEOCHEMICAL CHARACTERISTIC OF THE SOURCE ROCKS IN SONGLIAO AND OTHER BASINS OF NON-MARINE FACIES

He Zhigao

1981, 3(3): 197-206. doi: 10.11781/sysydz198103197

Abstract(441) PDF-CN(342)

Abstract:
Six geochemical characteristics of the source rocks in Songliao and other basins of non-marine facies are discussed in this paper.They are: (1) Low aromatic hydrocarbon in bitumen; (2) The functional relation between aromatic hydrocarbons and non-hydrocarbons; (3) Characteristics of nalkanes; (4) Characteristics of isoalkanes; (5) Characteristics of cycloalkanes; (6) Characteristics of aromatic hydrocarbons. In the last part of the article, two essential stages of oil generation of non-marine facies are discussed.

1981, 3(3): 207-212. doi: 10.11781/sysydz198103207

Abstract(385) PDF-CN(283)

Abstract:

EXPERIMENTAL RESEARCHES ON CHLOROFORM EXTRACTION OF SOURCE ROCK

Gian Zhihao, Zhou Mingyi, Chen Xiuyao

1981, 3(3): 213-222. doi: 10.11781/sysydz198103213

Abstract(605) PDF-CN(262)

Abstract:
Systematical experiments were mode on Chloroform extraction of source rock. Based on the result of the experiments, certain modifications and complements to the "Operating Manual of Chloroform extraction of source rock" are suggested. 1.The extractions are almost completed in a duration of 72 hours for detritus and 48 hours for carbonates. 2.The temperature for removing residual solvent in the extracts Should be lowered to 55-60℃(instead of 60-65℃)in order to keep lighter components in the extracts. 3.To seperate the element sulfur dissolved in solvent from organic extracts can be carried out during extraction by placing thin plates of red copper in the bottom of soxhle extractor,the element sulfur is reduced into cupric sulfide and pricipitated. 4.The commercial chloroform should be purified and the filter paper should be pre-extracted in order to minimize the blank to less than I mg fer each run.

DISCUSSION ON THE PROBLEM OF CONTAMINATION OF SAMPLES IN THE STUDY OF ORGANIC GEOCHEMISTRY

Wu Deyun

1981, 3(3): 223-229. doi: 10.11781/sysydz198103223

Abstract(505) PDF-CN(240)

Abstract:
Samples which have been contaminated by improper packing may mislead the analytical results into false conclution.This kind of contamination was reported in foreign literature too.Obviously this problem remains prevailing and serious. Testing experiments on various packing materials indicated that adsorption is the main cause for contamination.Different packing materials have different comtamination effects on the same sample,while the same packing material also has different contamination effects on different samples.Such kind of contamination has changed the property, structure and composition of soluble organic matter in samples. For the sake of preventing samples from contamination and obtaining reliable analytical results,various kinds of packing material and dealing method are suggested.

A PRELIMINARY STUDY ON DISCRIMINATNG THE POLLUTED OIL BY THE FEATURES OF INFRAFED SPECTRUM

Yang Chuizhou

1981, 3(3): 230-237. doi: 10.11781/sysydz198103230

Abstract(403) PDF-CN(277)

Abstract:
In the molecular structure study, infra-red spectrophotometry is well known for its sensibility, rapidness accuracy and intactness of the sample.This new techmique has been widely used recently in petroleum geology.This paper describes a method of discriminating the crude oil from the polluted,which has been worked out on the basis of analytical data showing that different variaties of refined oil with different specific gravity have different styles of spectrum and different (converted)densities at certain specific wave numbers,and through simulation experiment.The applicability of this method is discuesed.

1981, 3(3): 238-239. doi: 10.11781/sysydz198103238

Abstract(387) PDF-CN(317)

Abstract:

1981, 3(3): 240-241. doi: 10.11781/sysydz198103240

Abstract(460) PDF-CN(264)

Abstract:

1981, 3(3): 242-243. doi: 10.11781/sysydz198103242

Abstract(378) PDF-CN(251)

Abstract:

1981, 3(3): 245-245. doi: 10.11781/sysydz198103245

Abstract(364) PDF-CN(218)

Abstract:

1981 Vol. 3, No. 3

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