酒泉盆地青西凹陷下沟组混积层系致密油成藏机理与富集影响因素

doi:10.11743/ogg20180414

Abstract

Abstract: Tight oil reservoir in mixed siliciclastic-carbonate strata is an important type of tight oil resources.This type of tight oil reservoir is widely distributed across China and North America,and is believed to have great resource potential.Study on tight oil accumulation mechanism and main controlling factors for enrichment in mixed siliciclastic-carbonate strata are of great significance.The mixed strata of the Xiagou Formation (K₁g),Qingnan subsag,Qingxi Sag,Jiuquan Basin,are the case of study.We restored its burial history,thermal evolution history and hydrocarbon generation history via basin simulation techniques,investigated the formation of abnormal overpressure,pressure difference evolution between reservoir and source rock,and corresponding lower limit of pore throat for tight oil charging,and discussed the controls on hydrocarbon charging,seepage and enrichment in the mixed strata.Results show that the timing of hydrocarbon generation varies from different members in the formation:K₁g⁰ source rocks generated hydrocarbons early at the end of Early Cretaceous due to the high heat flow value in the early stage,while source rocks of K₁g² and K₁g³ started to generate hydrocarbons late in the Neogene,and K₁g¹ source rocks generated hydrocarbons in two periods(one early and one late period).Overpressure was believed to be attributed to hydrocarbon generation.Ever since 20 Ma,the remaining pressure on the boundary of source and reservoir rocks increased from 2 MPa to 32 MPa.The lower pore throat limit for oil charging on the boundary of source and reservoir rocks is 6 nm.Tight oil charging in the mixed strata of the Xiagou Formation and its short-distance migration accord with the invasion-percolation way,resulting in the pervasive accumulation of tight oil within and nearby the source rocks.The source-reservoir configuration and their internal architectures are the main controls on tight oil enrichment:the self-sourcing reservoirs and "sandwich-type"reservoirs are more oil-enriched than the lower-source upper-reservoir ones and thinly interlayered ones.

Key words: oil-charging threshold of throat, overpressure from oil generation, source-reservoir combination, accumulation mechanism, tight oil, Qingxi Sag, Jiuquan Basin

CLC Number:

TE122.3

Guo Yingchun, Song Yan, Fang Xinxin, Jiang Zhenxue, Chen Jianjun, Guo Jigang. Tight oil accumulation mechanism and controlling factors for enrichment in mixed siliciclastic and carbonate sequences in the Xiagou Formation of Qingxi Sag,Jiuquan Basin[J]. Oil & Gas Geology, 2018, 39(4): 766-777.

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Tight oil accumulation mechanism and controlling factors for enrichment in mixed siliciclastic and carbonate sequences in the Xiagou Formation of Qingxi Sag,Jiuquan Basin

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