鄂尔多斯盆地东南部延长组致密油成藏条件及主控因素

Abstract

Abstract: No breakthrough has been made in tight oil exploration of the Yanchang Formation in southeastern Ordos Basin because of the low level of research on tight oil accumulation conditions.In order to evaluate tight oil exploration prospect of the Yanchang Formation,we studied in-detail the tight oil accumulation conditions in the study area studying respects of sedimentary microfacies,reservoir rock,cap rock and hydrocarbon migration.The high quality source rocks of Chang 7(7^th Member of the Yanchang Fm)are widely developed in the southeast region of the basin.The reservoir of the Yanchang Formation is tight. The favorable source-reservoir combination provided good geological conditions for tight oil accumulation.The Chang 6, Chang 7 and Chang 8(the 6^th,7^th and 8^th Members of the Yanchang Fm)intervals are the main targets for exploration of tight oil in the Yanchang Formaiton in the study area.Tight oil reservoir formation and enrichment are controlled by sedimentary microfacies and quality reservoirs. Based on the study of inclusions temperature,thermal history,illite dating,saturation pressure and other methods,the tight oil accumulation period in Yanchang Formation is set at the Early Cretaceous and was controlled by the Late Mesozoic tectonic thermal event, thus tight oil accumulation occurred in late stage.

Key words: tight oil, timing of petroleum accumulation, accumulation condition, tectonic-thermal event, thermal history, Ordos Basin

CLC Number:

TE112.3

Ren Zhanli, Li Wenhou, Liang Yu, Wu Xiaoqing, Yu Qiang, Ren Long, Wang Wei. Tight oil reservoir formation conditions and main controlling factors of Yanchang Formation in southeastern Ordos Basin[J]. Oil & Gas Geology, 2014, 35(2): 190-198.

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Tight oil reservoir formation conditions and main controlling factors of Yanchang Formation in southeastern Ordos Basin

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