陕北地区延长组长10油层组成藏特征

doi:10.11743/ogg20110508

Abstract

Abstract:

Oil-source correlation is performed in Chang-10 interval of the Yanchang Fm through comparative analysis of the geochemical characteristics of Chang-10 crude oil,Chang-7 and Chang 9 source rocks,as well as difference analysis of fluid inclusions homogenization temperature distribution between Chang-10 reservoir and other reservoirs with hydrocarbons from Chang 7 source rocks.Moreover,the factors controlling hydrocarbon pooling in Chang-10 are also identified based on sedimentary and reservoir characteristics.The result shows that the Chang-9 is the major source rocks for the Chang-10 oil reservoir,to which the Chang-7 also contributed limited hydrocarbons.The formation of the Chang-10 oil reservoir was controlled by various factors such as quality,deposition,diagenesis and micro-structure of source rocks.The distribution of the Chang-10 oil reservoir was controlled by the distribution and development of the Chang-9 source rocks.Favorable sedimentary facies belts,diagenetic facies zones and high overpressure zones of the Chang-9 dark mudstone are the favorable target areas for discovering oil reservoirs.The Chang-10 oil reservoir is controlled by both structure and lithology.Three main reservoir types are identified,including structural-lithological reservoir,up-dip pinch-out sandstone reservoir and up-dip tight layer sealing reservoir.

Key words: 17α(H)-diahopane, fluid inclusion, Chang-10 oil reservoir, controlling factor of hydrocarbon accumulation, oil-source correlation, northern Shaanxi province, Ordos Basin

CLC Number:

TE122.1

Li Shixiang, Liu Xianyang, Han Tianyou, Huang Jinxiu, Jiao Jun. Characteristics of hydrocarbon pooling in Chang-10 interval of the Yanchang Fm in the northern Shaanxi province[J]. Oil & Gas Geology, 2011, 32(5): 698-709.

References

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Characteristics of hydrocarbon pooling in Chang-10 interval of the Yanchang Fm in the northern Shaanxi province

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