Hydrocarbon Accumulation Main-Controlling Factor Analysis of Chang2 Reservoir in Zhijing-Ansai of Ordos Basin

doi:10.3969/j.issn.1006-6535.2020.04.008

Abstract

Abstract: In order to understanding the complex geology of Chang₂ oil reservoir in Zhijing-Ansai and determine the main-controlling factors of hydrocarbon enrichment, the sedimentary facies, sandbody distribution patterns, favorable traps and other hydrocarbon enrichment mechanisms were comprehensively analyzed by the researches on source-rock, sedimentary facies, favorable sandbodies, migration channels, trap conditions, etc. Result indicates that the hydrocarbon enrichment in Chang₂ oil reservoir are dependent on multiple factors, including hydrocarbon source, unconformity, low-amplitude structure, sedimentary facies, reservoir properties, caprock properties, etc. The matching between the high-permeability sandbodies at the junction of distributary channels and the near-east row nose-shaped uplift is favorable to hydrocarbon accumulation. The caprock and longitudinal sandbody structures result in the hydrocarbon enrichment in Chang₂Ⅰ³ sub-layer. There are lithology, structure-lithology and weak structure-lithology reservoir categories in Chang₂ oil reservoir due to multiple controlling factors. This research could provide certain guidance for the further exploration in Chang₂ oil reservoir.

Key words: Ordos Basin, Zhijing-Ansai, Chang₂ oil reservoir, hydrocarbon accumulation main-controlling factor, reservoir category

CLC Number:

TE121.1

Feng Shunyan, Zhang Xiaohui, Li Cheng, Jing Xianghui, Sun Lei. Hydrocarbon Accumulation Main-Controlling Factor Analysis of Chang₂ Reservoir in Zhijing-Ansai of Ordos Basin[J]. Special Oil & Gas Reservoirs, 2020, 27(4): 54-59.

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Hydrocarbon Accumulation Main-Controlling Factor Analysis of Chang₂ Reservoir in Zhijing-Ansai of Ordos Basin

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