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二连盆地反转构造反转程度定量研究及对油气成藏的影响 被引量:8

Quantatitive study on inversion degree of inversion tectonics and its impact on hydrocarbon accumulation in Erlian Basin, Northern China
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摘要 基于二连盆地8个富油凹陷的三维地震资料、录井、岩心、薄片观察以及包裹体测试资料,对二连盆地反转构造的反转程度进行定量研究,提出用剥蚀比率表征褶皱型反转构造反转程度,并统计剥蚀比率与反转构造含油气性的关系,以巴音都兰凹陷为例研究反转程度对油气成藏的影响。研究结果表明:剥蚀比率在0.22~0.46之间,即反转程度适中时,反转构造含油气性较好;适度的反转对裂谷盆地圈闭形成有建设作用,可以形成挤压反转背斜及砂岩上倾尖灭等圈闭构造;同时适度的反转挤压会促进云质储层次生孔隙和裂缝的产生,对储层的形成和改造有积极影响;此外反转引起的地层抬升影响源岩生烃及油气成藏过程:导致源岩两次生烃及油藏两期成藏,且反转程度的差异导致凹陷内深洼带油藏以早期低熟油充注成藏为主,缓坡带油藏以晚期成熟油充注成藏为主。 Based on the comprehensive 3D seismic, logging data, core and thin section observation, and fluid-inclusion analysis, inversion degree of inversion tectonics in Erlian basin was analyzed and erosional rate was proposed to indicate the inversion degree of fold-type inversions. The statistical relationship between the erosional rate and the hydrocarbon occurrence of inversion tectonics was studied. The results show that the mild inversion with erosional rate of 0.22-0.46 is favorable condition for hydrocarbon accumulation in inversion tectonics. Then, using Bayindulan sag as an example the inversion's impact on hydrocarbon accumulation in Erlian basin was illustrated. The inversion plays a constructive role in trap formation, such as compressional anticline and sandstone pinch-out trap in study area; mild lateral compression exerted by inversion may induce the secondary pores and fractures in dolomitic sandstones to improve the physical property of reservoir; cooling of source rock caused by inversion uplift may shortly cease the hydrocarbon generation and results in two-stages of hydrocarbon generation and accumulation. Owing to differential inversion of tectonic belts, the reservoir in deep trough is mainly charged in early stage with low-mature oil and the reservoir in gentle slope is mainly charged in late stage with mature oil.
出处 《中南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2015年第11期4136-4145,共10页 Journal of Central South University:Science and Technology
基金 中国石油华北油田公司重大项目(HBYT-YJY-2011-JS-429)~~
关键词 反转程度 剥蚀比率 圈闭形成 云质储层 成藏过程 巴音都兰凹陷 二连盆地 inversion degree erosional rate trap formation dolomitic reservoir accumulation process Bayindulan sag Erlian Basin
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