四川盆地高石梯地区震旦系岩溶塌陷储集体成因及意义

发布时间：2018-04-11 06:09

本文选题：岩溶塌陷体 + 走滑断裂　；参考：《天然气地球科学》2017年08期

【摘要】：基于高精度三维地震资料以及相干地震属性,对川中高石梯地区广泛发育的岩溶塌陷体进行识别。塌陷体主要分布在张性走滑断裂附近以及断裂交叉处;在地震剖面上表现为垂向多组同向轴连续下凹,呈类透镜体状,并伴随发育多期同心环形断层,纵向延伸可达前震旦系基底。研究区内广泛发育继承性断裂,特别是兴凯地裂运动产生的张性断裂,为淡水和热液运移提供良好的渗流通道,拉张活动越强烈,热液通道越发育,形成的塌陷体规模越大。结合岩心资料及地球化学分析,认为该区岩溶塌陷储集体的形成主要受构造—热液溶蚀作用影响。该类塌陷体在先存孔隙、裂缝的基础上,后期受到热液作用的改造形成晶间孔、溶孔等储集空间,储集物性得到进一步的改善,可以成为川中地区有较大勘探潜力的目标。
[Abstract]:Based on the high precision 3D seismic data and coherent seismic attributes, the karst collapse bodies widely developed in Gaoshiti area, central Sichuan are identified.The collapse body mainly distributes near the tensional strike-slip faults and the intersections of the faults, and in the seismic profile, it appears as vertical multiple groups of concave concave in the same axis, which is lenticular and accompanied by the development of multi-phase concentric annular faults.The longitudinal extension can reach the Psinian basement.Inherited faults are widely developed in the study area, especially the tensional faults caused by the Xingkai fissure movement, which provide a good seepage channel for fresh water and hydrothermal migration. The stronger the tensile activity is, the more developed the hydrothermal channel is, and the larger the scale of the collapse body is.Based on the core data and geochemical analysis, it is considered that the formation of karst collapse reservoir in this area is mainly affected by tectonic-hydrothermal dissolution.On the basis of pre-existing pores and fractures, this kind of collapse body is transformed by hydrothermal action into intergranular pore, dissolved pore and other reservoir space, and the reservoir physical property is further improved, which can become the target of great exploration potential in the central Sichuan area.
【作者单位】：中国石油东方地球物理勘探有限责任公司;成都理工大学;中国石油西南油气田公司;
【基金】：中国石油天然气集团公司重大专项“深层油气田勘探开发关键技术研究”课题4“深层地震资料保幅处理与叠前储层描述新技术”(编号:2014E-3204)资助
【分类号】：P618.13;P631.4

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