石油实验地质

ANALYSIS OF FAVOURABLE REGIONS OF ACCUMULATION AND PRESERVATION FOR NATURAL GAS IN CHINA AS VIEWED FROM PEAK GAS GENERATION AND DISTRBUTIVE REGULARITIES IN GLOBAL GIANT GAS FIELDS

Zhang Yigang, Xiong Shousheng, Song Guojun

1990, 12(3): 213-230. doi: 10.11781/sysydz199003213

Abstract(712) PDF-CN(418)

Abstract:
84 global big and giant known gas fields were analysed for systematic mathematical statistics.Natural gas pools were the products resulted from the dynamic equilibriums of generation, accumulation and separation; the newer the age of peak gas generation for source rocks and the more stable the structural conditions were, the more promising the prospect would be. Eogene was the period of peak gas generation for source rocks of global large gas fields; and humic gas fields were formed in coal-bearing series during the early stage of gas generation. Regions with huge volumes of source rocks, peak gas generation and the structural conditions of rather stable subsidence are favourable to the formation of large gas fields.Tarim, South China Sea, East China Sea, West Taiwan Seas, Ordos, Sichuan and Chuxiong Basins, are all favourable regions for the accumulation and preservation of natural gas for their later peak gas generation and stable structural conditions.

GEOCHEMICAL CHARACTERISTICS OF HYDROCARBONS IN YAKELA STRUCTURE OF SHAYA UPLIFT IN NORTHERN TARIM BASIN AND THEIR GENERATION, MIGRATION AND ACCUMULATION

Hu Boliang, Shen Jianzhong

1990, 12(3): 232-247. doi: 10.11781/sysydz199003232

Abstract(615) PDF-CN(396)

Abstract:
The geochemical characteristics,and the generation,migration and accumulation of hydrocarbons in Yakela structure of northern Tarim basin were systematically discussed with abundant data. Based on the analysis of the history of structural evolution, the auth ors proposed a model for hydrocarbon generation, migration and accumulation in the region by full use of the geochemical characteristics.

GENESIS OF CARBON DIOXIDE WITH HIGH PURITY IN EAST CHINA

Guan Xiaoru

1990, 12(3): 248-258. doi: 10.11781/sysydz199003248

Abstract(512) PDF-CN(404)

Abstract:
Here the genesis of gas pools of carbon dioxide in east China are analysed and discussed. Based on the principles of plate tectonics and the forming mechanism of rift basin, it is considered that the formation of high purity-carbon dioxide was closely related to volcanic activities, probably, it came from deep crust down to the mantle. In the process of the formation and evolution of hydrocarbon-bearing rift basin, frequent volcanic eruptions had provided gas sources for gas pools of carbon dioxides. Besides, rift basin processed the conditions of reservoir and preservation for the formation of oil and gas (including carbon dioxide) pools.

TRIASSIC LITHOFACIES-PALAEOGEOGRAPHIC OUTLINE AND PALAEOTECTONIC CONFIGURATION IN ASIA AND THE CENTRAL PART OF PACIFIC REGION

Qiu Dongzhou

1990, 12(3): 259-272. doi: 10.11781/sysydz199003259

Abstract(499) PDF-CN(394)

Abstract:
Triassic Lithofacies-Palaeogeographic Maps in Asia and the Central Part of Pacific Region"has been compiled and studied, and several points are clear. 1.Unified division and comparision could be made between stages of Triassic strata within the region; 2.Indo-China epoch was a turning stage for tectonic evolution. The major expressions were the final closing of the north branch of palaeo-Tethys, northward peace-together of Yangtze and Qiantang continental blocks, further accretion of the south branch, with the palaeog-eographic relief of sea in-south and land in-north ended and east-west differential configuration started; 3. Six tectonic areas were divided within the region, namely, southern part of north Asia continent, southern continental margin of north Asia, intercontinent between south and north Asia continents, northern continental margin of south Asia, northern part of south Asia continent and circum Pacific continental margin in northern and eastern parts of south Asia continent; 4.Summary of the lithofacies-palaeogeographic outline and characteristics of early, middle and late Triassic; 5. Summaries of the major Triassic sediments and the occurrence conditions of stratigraphically controlled mineral resources.

TECTONIC MIGRATION IN ALASHAN ARC BASIN SYSTEM

Wang Tonghe

1990, 12(3): 273-281. doi: 10.11781/sysydz199003273

Abstract(463) PDF-CN(369)

Abstract:
Tectonic migration is important both in theory and practice in the course of researching for the formative features and evolving patterns of oil and gas basins, as well as for predicting the types of oil and gas pools, selecting favourable areas, estimating reserves, therefore, directing exploration, and finding the time-space distributive patterns of petroleum. On the basis of the data of geology, geophysics, drilling and satellite image, the evolution process, formative features, tectonic types and distributive patterns for Alashan arc Basins are discussed. The top of the arc is located around Minqin County. The splitting and falldown of blocks in the basins and their subsidence and depositing centers were migrated from the top to the wings of the arc through the whole time. Finally, the conditions of petroleum geology of the basin system are discussed in the paper, pointing out that the areas around the top of the arc and Basins adjacent to it are most prospecting.

FORMATIVE CONDITIONS OF COMPOSITE HYDROCARBON POOLS IN FENGHUADIAN STRUCTURE OF HUANGHUA DEPRESSION

Gao Xixing

1990, 12(3): 282-290. doi: 10.11781/sysydz199003282

Abstract(454) PDF-CN(240)

Abstract:
Fenghuadian structure is an inherited palaeo-structure of long development. Controlled by two major faults of Kongxi and Fenghuadian, various types of oil-gas assemblages were developed in depressions on the both sides. The migration and accumulation were orientated to faultblocks with higher positions, as a result, different types of superimposed composite hydrocarbon pools were formed. There are hydrocarbon pools of buried hill in Mesozoic Anshan rocks, as well as of structural fault blocks in sandstone of Kongdian Formation. This is a typical model of hydrocarbon enrichment in the south of Huanghua depression.

SEDIMENTARY HISTORY AND OIL AND GAS IN CONTINENTAL SHELF BASIN OF EAST CHINA SEA

Hu Bigui

1990, 12(3): 291-296. doi: 10.11781/sysydz199003291

Abstract(513) PDF-CN(280)

Abstract:
The basin within the continental shelf of east China Sea was subjected to regional tectonic events during the period from late Cretaceous to Quaternary, which experienced four sedimentary cycles, including three sedimentary cycles of transgression-regression and one transgressive sedimentary cycle, correspondingly, three complete suites of oil and gas assemblages and one suite of natural gas assemblage were developed on the middle and lower parts of sedimentary cycles.The petroliferousness is of the best for the oil and gas assemblages from upper Cretaceous to Eocene as being proved by drilling.Pinghu oil-gas field and a number of oil-gas structures have already been discovered.

DISTRIBUTIVE REGULARITIES OF SEDIMENTARY FACIES DURING CHANGXING PERIOD OF THE LATE PERMIAN IN SU-ZHE-WAN (JIANGSU-ZHEJIANG-ANHUI PROVINCES) ADJACENT AREA

Wang Shuyi, Zhu Hongfa, Chen Yazhong, Shi Weijun

1990, 12(3): 297-306. doi: 10.11781/sysydz199003297

Abstract(662) PDF-CN(277)

Abstract:
There are marked distributive regularities for the sediments in Chang xing period of the late Permian. Basin facies is found in the area west to Xuan-cheng-Guangde-Yixing-Jiangying. While east-southwardly, in the area of Wuxi-Changxing-Jingxian, basin margin facies is localized. They can be roughly attributed ot Dalong Formation and"Dark Changxing", respectively. East to basin margin facies is platform facial sediments,i.e."White Changxing" distributive area where the sediments of high energized platform margin facies were devloped on the transitive zone between platform facies and basin margin facies. An example is taken——Changxing Formation in Songshan, Wuxi, which is a typical sedimentary assemblage of sponge reef; in contrast, Changxing formation in Mashishan of Xishan belongs to a sediment of chl-orophyceae beach facies with spongeous bioherm interbeded in middle-upper sections.Both reflect a high energized environment of platform margin. Along from Xishan, and Songshan, northwardly to Shazhou and southward to the zone of Nangaoqiao in Wuxing, Changxing Formation becomes thickened compared with the two sides, and the zone is just on the facial change belt between"Dark Changxing" and" White Changxing", showing a trend clearly outlined for the platform margin. Therefore the Changxing Formation in the area is characteristic of regular facies belt distribution in a pattern of basin-basin margin-platform margin-platform. The authors do not think that Jiangying-Yixing palaeo-uplift existed during Changxing period based on the distributive regularities of sedimentary facies. The sediments in Changxing period in the area had been absent due to denudation in early Triassic. The high energy zone of platform margin was distributed on the side of" White Changxing" of the juncture between "Dark Changxing"and" White Changxing". The discovery of sponge-reef biogenic beach in this facies belt provides leads for exploration of hydrocarbons and other related minerals in the area.

CAP ASSESSMENT AND GENETIC MECHANISM OF ISOLATED ISLAND SHALLOW GAS POOLS

Li Xuetian, Dai Xianzhong, Zhang Wenda, Xiao Wuyan

1990, 12(3): 307-315. doi: 10.11781/sysydz199003307

Abstract(536) PDF-CN(330)

Abstract:
Isolated island gas pool is a kind of shallow gas pools with low pressure, and the porosity of its capping mudstone bed all exceeds 6%. Using mercury injection-gas absorption method, several characteristic parameters have been obtained: the distributive patterns of abrupt pressure, mean radius and micropore radius,and the saturation under the capping bed, the gas column height, and shielding factor. Combined with geological characteristics of gas field in Jiyang depression, the capping bed of isolated island shallow gas pools are quantitatively evaluated. The effects of capping bed are discussed, proposing that there must be certain regular changes in the enrichment coeficient of reserves, the contents of natural gas components and the pressure coeficient of gas reservoir due to the existence of capping bed. With the application of characteristic parameters for capping bed, the formative preserving mechanisms for isolated island shallow gas pools are analysed, suggesting good correlations of the initial formation pressure, gas bearing saturation and elastic yields with abrupt pressure, shielding factor, gas column height of the capping bed.

ISOTOPIC MEASUREMENTS OF NITROGEN AND THEIR APPLICATION IN NATURAL GAS

Xu Yongchang, Sun Mingliang, Shen Ping, Wang Xianbin

1990, 12(3): 316-325. doi: 10.11781/sysydz199003316

Abstract(504) PDF-CN(297)

Abstract:
The techniques of isotopic measurements on nitrogen in natural gas, particularly, the pretreatments of the samples of natural gas and air are discussed. Based on ³He/⁴He, some cases relating to geochemical characteristics of nitrogen in natural gas are also present in the paper.

STUDY OF AN ANALYTICAL METHOD FOR C₁-C₉ HYDROCARBONS IN ROCKS AND NATURAL GAS

Zhan Zhiyu

1990, 12(3): 326-332. doi: 10.11781/sysydz199003326

Abstract(500) PDF-CN(320)

Abstract:
The new technique for analysing light hydrocarbons introduced in the paper is of characteristic, which differs from techniques currently used home and abroad. It is based on the principles of energy conversion in thermodynamics. Firstly an original rock sample is directly put into a tube of degasification device, and the deabsorption of light hydrocarbons under low vaccum negative pressure is accomplished by use of a high speed rotation agitator. Then certain volume of deabsorbed gas is injected into a capillary column of high resolution and chromatography and determination and data process are performed under optimum conditions.

PRELIMINARY STUDY OF FOSSILS IN KEROGEN SAMPLES FROM SILURIAN IN SOUTHERN SICHUAN

Li Wenfeng

1990, 12(3): 333-337. doi: 10.11781/sysydz199003333

Abstract(492) PDF-CN(241)

Abstract:
The analysis of kerogen under transmitted light is quite a new method for estimation of source rocks. The author determined some kerogen samples from Silurian in southern Sichuan, under microscopic transmitted light. During the process, he found that there were many well preserved fossils. The discovery is important in further study of kerogen paleontology and the prediction of sedimentary environment.

1990 Vol. 12, No. 3

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