下寺湾油田延长组长8段致密油富集主控因素及“甜点”模式

Abstract

Abstract:

Some breakthroughs have been made in the exploration of tight sandstone oil reservoir in Chang-8 Member of Yanchang Formation in Xiasiwan Oilfield recently. However, as the basic geological study of Chang-8 Member is relatively weak and the hydrocarbon accumulation condition is complex, the main controlling factors of enrichment and the sweet spot mode have not been proved. Therefore, the development efficiency is low in most areas. In order to further explore the prospect of exploration and development for the tight sandstone oil reservoir in Chang-8 Member, based on the previous study, the main controlling factors of reservoir formation were analyzed deeply in the study area by the data of core, logging, mud logging, analysis and testing, and combined with the production data of oil testing, production testing and horizontal wells. The results show that the accumulation of the tight sandstone oil reservoir Chang-8 Member is mainly controlled by four main control factors: high quality source rocks, excellent reservoir properties under favorable sedimentary microfacies, higher excess pressure difference and widely developed micro-fractures. And on this basis, five sweet spot modes of Chang-8 Member tight oil could be established, and the reasonable development modes are analyzed respectively according to these five modes, which indicated the direction for the efficient exploration and development of the tight oil reservoir in Chang-8 Member.

Key words: Chang-8 Member, tight sandstone oil reservoir, main controlling factors, sweet spot mode, Xiasiwan Oilfield

CLC Number:

TE122.1

LI Jinfeng,YANG Lianru,ZHANG Fengbo,LUO Jiangyun,XUE Quan,CAO Dandan,ZHANG Xianwei,WU Dan. Main controlling factors of enrichment and sweet spot mode of tight sandstone oil reservoir in Chang-8 Member of Yanchang Formation in Xiasiwan Oilfield[J].Reservoir Evaluation and Development, 2019, 9(6): 1-9.

Figures/Tables 8

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Table 1

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References 24

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层位	井数/口	发育数（条）/口
长8₁	53	9.0
长8₂	53	7.0

Main controlling factors of enrichment and sweet spot mode of tight sandstone oil reservoir in Chang-8 Member of Yanchang Formation in Xiasiwan Oilfield

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