川西南地区中三叠统雷口坡组碳酸盐岩储层特征

Characteristics of Carbonate Reservoir of Middle Triassic Leikoupo Formation in Southwestern Sichuan

通过对储集层样品物性等资料的综合分析,研究了川西南部地区雷口坡组主要储集层类型和位置,以及雷口坡组碳酸盐岩的储层特征和影响储层发育的主要因素。结果显示:颗粒白云岩储层和微生物灰岩储层为主要储集层,其中储集较好的层位主要发育在雷口坡组三段和四段;浅水高能环境使得川西南部雷口坡组储层主要发育在雷三段和雷四段,成岩期胶结作用和压实作用破坏了储层的性质,埋藏期的溶蚀作用和白云石化作用与储层发育有极为密切的关系。该研究为四川盆地西南部地区雷口坡组的储层评价提供有力的依据。

Based on the comprehensive analysis of core observation and physical properties of reservoir samples,the main types and locations of reservoirs,the characteristics of carbonate reservoirs and the main factors affecting the development of reservoirs in Leikoupo Formation are studied.The results show that the dolomite and limestone reservoirs are the main reservoirs,and the better reservoirs are mainly developed in the 3rd and 4th member of Leikoupo Formation..The reservoirs of Leikoupo Formation are mainly developed in the third and fourth member of Leikoupo Formation due to the high energy environment in shallow water.The properties of reservoirs are destroyed by cementation and compaction in diagenetic stage,while the physical properties of reservoirs are closely related with the dissolution and dolomitization in burial stage.This study provides a strong basis for reservoir evaluation of the Leikoupo Formation in the southwestern Sichuan Basin.