四川盆地下寒武统龙王庙组沉积相与储层分布预测研究

发布时间：2018-01-25 22:10

本文关键词： 四川盆地龙王庙组碳酸盐缓坡颗粒滩白云岩储层储层成因和分布　出处：《天然气地球科学》2017年08期 　论文类型：期刊论文

【摘要】：寒武系龙王庙组白云岩已经成为四川盆地非常重要的天然气勘探领域,并在高石梯—磨溪地区发现了万亿方储量规模的大气藏,但对储层成因和分布规律认识不清已经成为制约龙王庙组白云岩勘探的瓶颈。基于露头地质调查、岩心和薄片观察、储层地球化学特征及储层模拟实验,对这套白云岩储层的特征、成因和分布规律做了深入的研究,取得2项认识:一是四川盆地寒武系龙王庙组可划分为上、下2段,编制了以段为单元的岩相古地理图2张,建立了碳酸盐岩缓坡沉积模式,颗粒滩主要分布于上段的浅缓坡;二是颗粒滩是龙王庙组白云岩储层发育的基础,同生溶蚀作用是龙王庙组颗粒滩储层孔隙发育的关键,受暴露面控制,埋藏期溶蚀孔洞不但有规模,而且主要沿同生期的孔隙带发育,具继承性,分布有规律可预测。龙王庙组白云岩储层成因地质认识揭示储层的发育不仅限于高石梯—磨溪构造表生岩溶发育区,全盆地广布的颗粒滩相沉积都是潜在的勘探对象。
[Abstract]:The dolomite of Cambrian Longwangmiao formation has become a very important field of natural gas exploration in Sichuan Basin, and an atmospheric reservoir of one trillion square reserves has been discovered in Gaoshiti-Moxi area. However, unclear understanding of reservoir genesis and distribution law has become the bottleneck of dolomite exploration in Longwangmiao formation. Based on outcrop geological survey, core and slice observation, reservoir geochemical characteristics and reservoir simulation experiments. The characteristics, genesis and distribution of this set of dolomite reservoir have been deeply studied, and two understandings have been obtained: one is that the Cambrian Longwangmiao formation in Sichuan Basin can be divided into upper and lower sections. Two lithofacies paleogeographic maps are compiled, and carbonate gentle slope sedimentary model is established. Granular beach is mainly distributed in shallow gentle slope of upper member. Second, granular beach is the basis of dolomite reservoir development in Longwangmiao formation, and syngenic dissolution is the key to pore development of grain beach reservoir in Longwangmiao formation, which is controlled by exposed surface and has not only large scale in burial period. And mainly along the syngenetic pore zone development, with inheritance. The genetic geological understanding of dolomite reservoir in Longwangmiao formation reveals that the reservoir development is not limited to the Gaoshititian-Moxi structural epigenetic karst development area. The widely distributed granular beach facies deposits throughout the basin are potential targets for exploration.
【作者单位】：中国石油杭州地质研究院;中国石油集团碳酸盐岩储层重点实验室;中国地质大学(北京)地球科学与资源学院;
【基金】：国家科技重大专项(编号:2016ZX05004-002) 中国石油天然气股份有限公司重大科技专项“深层油气勘探开发关键技术研究”(编号:2014E-32)联合资助
【分类号】：P618.13
【正文快照】： 3.中国地质大学(北京)地球科学与资源学院,北京100083)等.四川盆地下寒武统龙王庙组沉积相与储层分布预测研究[J].天然气地球科学,2017,28(8):1176-1190.]0引言寒武系是四川盆地天然气勘探的重要领域,但近50年来,寒武系长期处在主探层系震旦系灯影组气藏过程中的兼探地位。遵

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