川东三岔坪潜伏构造石炭系储层特征及有利区预测

CARBONIFEROUS RESERVOIR CHARACTERISTICS IN SANCHAPING BURIED STRUCTURE IN THE EAST OF SICHUAN AND PRIDICTION FOR FAVOURABLE EXPLORATION AREA

通过对川东三岔坪潜伏构造石炭系储层特征的研究,发现储集空间以溶孔及晶间孔为主;储集类型属裂缝-孔隙型;纵向上以Ⅲ类储层为主,Ⅱ类储层呈局部分布(具有2个相对的高孔带);储层的主要控制因素为溶蚀及构造作用。采用改进曲率及地震方法对石炭系储层进行了综合预测后指出,早期认为的石炭系储层缺失区并不存在,有利储层分布区呈局部的点团状或条带状分布并且是该区下步勘探及井位部署的重点区域。

Based on the study of Carboniferous reservoir characteristics in Sanchaping buried structure, it is found that the reservoir space is dominated with dissolved pore as well as intercrystalline pore and the reservoir belongs to fractured-porous one. It is vertically dominated with the Type Ⅲreservoir and it is locally distributed with the Type Ⅱ reservoir （there are two relatively high porosity zones）. The major controlling factors of reservoir are dissolution and tectonic effect. With the help of improved curvature and seismic method, the comprehensive prediction for Carboniferous reservoir was made. The prediction results show that the early-thought area where there is not Carboniferous reservoir does not exist and the favourable reservoir area is distributed with local patch or strip where the next exploration and drilling well deployment are located.