收稿日期: 2016-06-03
修回日期: 2016-09-03
网络出版日期: 2017-08-10
基金资助
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.
Genesis research of collapsed-paleocave systems in Sinian carbonate strata in central Sichuan Basin,SW China
Received date: 2016-06-03
Revised date: 2016-09-03
Online published: 2017-08-10
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。
丁博钊,张光荣,陈康,耿玮,朱兴卉,范畅 . 四川盆地高石梯地区震旦系岩溶塌陷储集体成因及意义[J]. 天然气地球科学, 2017 , 28(8) : 1211 -1218 . DOI: 10.11764/j.issn.1672-1926.2016.11.004
The massive collapsed-paleocave systems in Sinian carbonate strata in central Sichuan Basin are found based on 3D high resolution seismic data and coherence seismic attribute.Collapsed-paleocave systems are distributed near the strike-slip faults and the fault intersect spots;on the profile,they occur as seismic events push-down,lenticularity,and accompany with multi-phase concentric circular faults,the vertical extension of the collapsed-paleocave systems can reach the Pre-Sinian basement.The inherited faults are widely developed in the research area,especially the tensional faults which are generated by the Xingkai Taphrogeny,providing channel for water migration and hydrothermal migration.As the extension acted more vigorous,the hydrothermal channel would be more developed,and the size of collapsed-paleocave system would get larger.Based on the core and geochemical data,it is assumed that the formation of collapsed-paleocave system is mainly affected by the structured-hydrothermal karstification.Pore and fracture in the collapsed-paleocave systems gradually form intracrystalline pores and hydrothermal karstificated pores through late hydrothermalism,by which the petrophysical properties of the collapsed-paleocave systems are further improved.The collapsed-paleocave systems are probably the favorable targets for gas exploration.
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