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STUDY ON OIL SOURCE IN CAINAN OILFELD, JUNGGAR BASIN

Ding Anna, Meng Qianxiang, Hui Rongyao

Xinjiang Petroleum Geology 1997, 18 (4): 324-329.

Abstract （156）

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On the basis of study on geochemical characteristics of saturated hydrocarbon of oil and source rock in Bajjiahai arch and its adjacent area in Junggar basin , understandings about component of oil source ，hydrocarbon-forming environment, evolutional degree and migration model of oil are obtained. It is pointed out that. Middle and Lower Jurassic (especially argillaceous rock of Sangonghe fommation) in Bajiahai arch and Fukang sag are major source rock in Cainan oilfield, and these provide scientific basis for further oil/ gas exploration.

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MECHANISM OF PRIMARY MIGRATION OF COAL-FORMED OIL N THE JURASSIC OF SANTANGHU BASIN, XINJIANG: DISCUSSION

Huo Yongzhong, Zhong Ningning

Xinjiang Petroleum Geology 1997, 18 (2): 130-134.

Abstract （115）

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Based on the analysis of physical properties of Jurassic coal and their evolution regularity in Santanghu basin, Xinjiang, combined with the study on onganic petrology and organic geochemistry of coal-formed oil, this paper considered that the amount of oil generation in the coal is higher than its pore storge capacity at R_o = 0.65% ~ 0. 85%, which requires the forced primary migration of coal-formed oil. The high-pressure of fluid in the coalbed, induced by plastic compaction, resulted in the pore connectivity and microfracture along which coal-formed oil migrated in successive bituminous network. There is the possibility of early generation and early expulsion because of Jurassic coal at early maturity level. The coal-formed oil is characterized by heavy end components, high wax content and high viscosity which is determined by Kerogen, maturity and expulsion mechanism in the coal-bearing Jurassic.

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MACERALS AND PETROLOGY OF PALAEOZOIC SOURCE ROCK IN TARIM BASIN

Cheng Dingsheng

Xinjiang Petroleum Geology 1997, 18 (1): 40-45.

Abstract （131）

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The maceral classification of Palaeozoic source rock in Tarim basin has been proposed based on the detailed microscopic examination. The hydrocarbon: generating potential of Palaeozoic source rock has been preliminarily evaluated by combining the petrology of each maceral with organic petrology. Cambrian source rock is dominated by secondary compositions, with low hydrocarbon-generating potential; Ordovician carbonate source rock is rich in alginate, with stronger hydrocarbon- generating capacity; the overmature Ordovician argillaceous source rock has low hydrocarbon-generating potential; Carboniferous argillaceous source rock is gas-prone while carbonate source rock is prone to generate both oil and gas.

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NITROGEN-BEARING AND NTTROGEN-RICH NATURAL GAS IN THE HINTERI AND OF JUNGGAR BASIN

Wang Yutao, Jiang Shaoin

Xinjiang Petroleum Geology 1997, 18 (1): 46-49.

Abstract （170）

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It is shown that natural gas of the Palaeozoic exhibits high contents of nitrogen in Lu-liang uplift in the hinterland of Junggar basin, based on the analysis of geochemistry,carbon isotope and light hydrocarbon composition data. Nitrogen is present in the natural gas of the Carboniferous and Triassic in Lunan arch, and rich in the gas of the Carboniferous in Shinan sag. Origin study suggested that this type of natural gas is probably associated with magmatic intrusion, and originated from the Carboniferous in the Shinan sag.

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SOURCE ROCK EVALUATION IN SOUTHWEST DEPRESSION OF TARIM BASIN

Liu Deguang, Wu Zhizhong, Li Yongguang, Chen Hong

Xinjiang Petroleum Geology 1997, 18 (1): 50-53.

Abstract （165）

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The concept of oil source abundance index is presented by combining organic abundance of source rock with geological analysis, and applied in Southwest depression of Tarim basin. It is suggested that Miocene and Upper Cretaceous-Paleogene can generate few or no hydrocarbons dark mudstone in Mid - Lower Jurassic, and dark carbonate rock in Carboniferous - Lower Permian and Cambrian-Ordovician have relatively higher hydrocarbon generating potential, and argillaceous rock of Palaeozoic can generate no hydrocarbon.

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