川西邛崃县白马庙气田上侏罗统蓬莱镇组沉积相及砂体展布研究

本文认为白马庙气田上侏罗统蓬莱镇组的主要沉积相类型为湖成三角洲和湖泊沉积。通常有2～3条主分流河道自北西方向进入研究区，三角洲属河控型鸟足状三角洲；滨、浅湖相构成了湖泊相的主要亚相类型。三角洲前缘为该区的优势亚相，砂体展布明显受控于水下分流河道、河口坝和远砂坝等微相，指状砂坝、复合式砂坝是该区蓬莱镇组Ⅲ、Ⅳ段(主力产气层段)的有利储集体。今后，基于沉积微相研究的砂体展布精细研究始终是该气田地质研究的重要课题之一。

Sedimentary facies and sandbody distribution of the Upper Jurassic Penglaizhen Formation in the Baimamiao gas field, Qionglai County, western Sichuan

Lacustrine deltaic and lacustrine deposits are a major type of sedimentary facies of the Upper Jurassic Penglaizhen Formation in the Baimamiao gas field. There are usually 2-3 distributary channels entering the study area from the northwest. This delta belongs to a river-dominated birdfoot delta. Lakeshore and shallow Lake deposits are main microfacies types of lake facies. In the study area, the delta front is a dominant microfacies, and sandbody distribution is apparently controlled by underwater distributary channel, river mouth bar and distal sandbar microfacies. Finger sandbars and compound sandbars are favorable reservoirs of Members III and IV (principal gas-producing zones) of the Penglaizhen Formation. The intensive study of sandbody distribution based on the sedimentary microfacies study will be always one of the important subjects of the geological study of the Baimamiao gas field in the future.