库车坳陷DB气田白垩系巴什基奇克组砂岩的多期溶蚀

发布时间：2018-01-29 01:14

本文关键词： 多期溶蚀砂岩巴什基奇克组白垩系气田库车坳陷　出处：《石油与天然气地质》2016年04期 　论文类型：期刊论文

【摘要】：以岩心观察、普通薄片和铸体薄片观察与鉴定为基础,辅以阴极发光显微镜、扫描电镜和油层物性分析等技术手段,结合区域地质研究成果,系统研究塔里木盆地库车坳陷DB气田白垩系巴什基奇克组砂岩储层溶蚀作用特征及其发育机制,并剖析其与孔隙演化的关系。结果表明,库车坳陷DB气田白垩系巴什基奇克组砂岩为特低孔-特低渗储层,发育多种溶蚀孔隙。储层经历多期溶蚀作用,依次为大气淡水表生淋滤溶蚀作用、有机酸溶蚀作用、微弱的碱性溶解作用和较弱的酸碱交替溶蚀作用,分别溶蚀早期碳酸盐胶结物、长石、不稳定岩屑和石英质组分等,形成粒间溶孔、溶蚀缝、超粒大孔隙、粒内溶孔等溶蚀孔隙。结合地层埋藏史、有机质发育史和构造演化史等研究成果,综合分析认为,DB气田多期溶蚀和烃类多期注入相匹配是形成现今高产气田的重要原因。
[Abstract]:Based on the observation and identification of core, ordinary and cast sheet, and with the help of cathode luminescent microscope, scanning electron microscope and reservoir physical property analysis, combined with the results of regional geological research. The dissolution characteristics and development mechanism of the sandstone reservoir of the Cretaceous Bashiqike formation in the DB gas field of Kuqa depression in Tarim Basin are systematically studied, and the relationship between the dissolution and pore evolution is analyzed. The sandstone of the Cretaceous Bashiqike formation of the DB gas field in Kuqa depression is an ultra-low porosity and very low permeability reservoir, and many kinds of dissolution pores are developed. The reservoir experienced many stages of dissolution, followed by atmospheric fresh water surface leaching dissolution. Organic acid dissolution, weak alkaline dissolution and weak acid-base alternate dissolution, corrosion of early carbonate cement, feldspar, unstable cuttings and quartz components, forming intergranular dissolution pore, dissolution fracture. Combined with the research results of stratigraphic burial history, organic matter development history and tectonic evolution history, it is considered that. The matching of multi-phase dissolution and multi-phase injection of hydrocarbon in DB gas field is an important reason for the formation of high-yielding gas field.
【作者单位】：中国石油大学地球科学与技术学院;中国石油塔里木油田分公司;中海石油(中国)有限公司湛江分公司;中国石化华北油气分公司;
【基金】：国家科技重大专项(2011ZX05003-04) 中国石油科技重大专项(2010E-2103)
【分类号】：P618.13
【正文快照】： 自20世纪80年代以来,人们愈加认识到碎屑岩中次生孔隙对油气储集的重要性,提出了包括大气淡水淋滤、碳酸水溶液引起的溶解、有机酸引起的溶解、收缩裂缝、粘土矿物转化、硫酸盐溶解和碱性介质引起的石英质组分溶解[1-11]等在内的众多成因机制。DB气田位于塔里木盆地库车坳陷克

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