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On the development mechanism of the lacustrine high-grade hydrocarbon source rocks of Chang 91 member in Ordos Basin

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Science China Earth Sciences 2007年第Z2期50卷 39-46页

作者： zhang wenzheng yang hua fu suotang zan chuanli Institute of Exploration Development and Research of PetroChina Company Limited Changqing Oilfield Branch Xi'an 710021 China PetroChina Company Limited Changqing Oilfield Branch Xi'an 710021 China Institute of Exploration Development and Research of PetroChina Company Limited Changqing Oilfield Branch Xi'an 710021 China Institute of Exploration Development and Research of PetroChina Company Limited Changqing Oilfield Branch Xi'an 710021 China

As revealed from recent drilling and organic geochemical testing and research, a series of lacustrine high-grade hydrocarbon source rocks was discovered in the upper section of the Chang 9 oil reservoir member of upper Triassic in Ordos Basin. The hydrocarbon source rocks show average TOC content as high as 5.03%, average bitumen "A" content as high as 0.8603%, and good quality organic precursors, which are of the sapropelic type mainly derived from lower aquatic plants and have reached the thermal evolution stage featured by oil-producing climax. Generally the lacustrine high-grade hydrocarbon source rocks were developed in local depressions of a lake basin, and the Chang 91 member was particularly formed in a depositional environment characterized by fresh water to weakly saline water, weakly oxidizing to weakly reducing setting and semi-deep lake facies, as was demonstrated by a variety of organic to inorganic geochemical parameters. As a result, high productivity constitutes the principal controlling force for generation of this series of high-grade hydrocarbon source rocks. Deposition of thinly-bedded and laminated tuffs as well as positive Eu anomaly corroborate the possible occurrence of anoxic geological event closely related to contemporaneous volcanic eruption, which would play a key part in development of the Chang 91 member of high-grade hydrocarbon source rocks.

关键词： Ordos Basin, terrestrial lake basin, high-grade hydrocarbon source rock, high productivity, geological event

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