成都市洛带地区沙溪庙组沉积相及储集条件分析

洛带地区沙溪庙组为河流-三角洲相沉积，“上沙”(J2s)储集砂体发育，经井间对比，划分出11套砂体，砂体呈条带状，沿NE—SW向构造展布，反映物源主要来自NE方向。储层主要为中一细粒岩屑长石砂岩，储层物性条件与新场“上沙”储层相似，但地层电阻率较低。目前已在遂宁组(J3sn)和“上沙”储层中发现了孔隙性储层，孔隙类型主要是次生孔隙，这对在洛带气田深层寻找孔隙性的气藏提供了重要依据。

Sedimentary Facies and Reservoir Conditions of the Shaximiao Formation in Luodai Region, Chengdu

Shaximiao Formation in the Luodai region belongs flu vial-delta facies deposit.According to the well correlation, reservoir sand bodi es in the Upper Shaximiao Formation (J 2s) may be divided into 11 suits whi ch occur in a banded shape in NE-trending structures. Most of the reservoirs con sist of medium- and fine-grained lithic arkose with physical conditions similar those of the Shaximiao Formation (J 2s) in Xinchang but lower electric resi stivity. At present, secondary porosity reservoirs have been discovered in the S uining Formation (J 3sn) and the Shaximiao Formation (J 2s) which prov ides important base for searching for deep porosity gas accumulation in the Luod ai gas field.