四川盆地西南部茅口期岩相古地理

根据野外露头、钻井、测井等资料, 对四川盆地西南部茅口组的岩性特征及岩相古地理进行了分析。结果表明，四川盆地西南部地区茅口组为台内浅滩和开阔海微相环境，并可划分出3 个沉积旋回，代表了茅口期的3 次海平面升降变化。其中第二沉积旋回海平面下降阶段为最重要的成滩期，这一时期浅滩广泛发育亮晶生屑灰岩，局部高地发育白云岩，经后期东吴运动改造，有望成为具有良好的储集物性特征的储集层。

Lithofacies Palaeogeography of Maokou Period in Southwestern Sichuan Basin

According to the data from field outcrops,drilling section and well logging,the lithologic characteristics and lithofacies palaeogeography of Maokou Formation in southwest Sichuan Basin are analyzed.The results indicated that Maokou Formation developed beach and open sea microfacies in southwest Sichuan basin and can be divided into three sedimentary cycles,which represent the three sea-level fluctuations in Maokou period.The second sedimentary cycle,the phase that sea level decline,becomes the most important period when shallow beach developed widely with the litholgy of sparite bioclastic limestone and partial dolomite.Transformed by the later Dongwu movement,shallow beach can be favorable reservoir.