气田磨溪区块外围地区龙王庙组储层特征描述

I摘要四川盆地下古生界-震旦系的勘探始于上世纪五十年代中期，经历持续的勘探和不断的探索，2012 年四川盆地中部磨溪 8 井下寒武系龙王庙组获得历史性突破。本次研究的重点区域与磨溪 8 井有关，研究区位置在磨溪东-龙女寺三维地震区及南充市以南，广安市以西二维地震工区，地理位置处于潼南县、南充市、和广安市之间，面积约 7400km2，区域构造位置处于川中古隆中斜平缓构造区乐山～龙女寺加里东古隆起的东端轴部及背斜北缘。研究目的层为寒武系龙王庙组。为进一步了解储层特征，本文调研了大量前人的文献资料，利用现有岩心，岩石薄片，测录井数据及地震资料等开展了对安岳气田磨溪区块外围地区龙王庙组地层进行研究。本文在研究中以井震结合的思路，对研究区地层进行地层划分对比，明确了磨溪区块外围龙王庙组地层特征及平面展布规律，在研究中发现龙王庙组储层主要发育于颗粒岩或者晶粒化的颗粒岩中，根据岩溶作用，未受后期岩溶叠合改造的颗粒岩储集空间为（溶扩）残余粒间孔和少量的粒内溶孔，受岩溶和重结晶影响的颗粒岩储集空间主要为粒间溶孔、晶间（溶）孔和小尺度的溶洞；总体来说，研究区储层物性较磨溪主体变差，表现为低孔、低渗、低自然伽马、低密度、低电阻率、高声波时差和高补偿中子孔隙度这些特征。关键词：磨溪外围地区；龙王庙组；滩相；储层特征IIAbstractThe exploration of the lower Paleozoic Sinian system in Sichuan Basin began in the mid-1950s, and experienced continuous exploration and exploration. In 2012, the Longwangmiao formation of Cambrian System in Moxi-8 well in the central Sichuan basin made a historic breakthrough. The key area of this study is related to well Moxi-8. The study area is located in the east of Moxi longnusi 3D seismic area, the south of Nanchong City, and the west of Guang'an City. It is located between Tongnan County, Nanchong City and Guang'an City, with an area of about 7400km2. The regional structure is located in the east end axis of Leshan longnusi Caledonian uplift, an oblique and gentle structural area in Central Sichuan ancient uplift And the northern margin of the anticli...