四川各类储集层的地质地球物理特征一、地层概况四川地层大体可分为以下四种类型。 1.海相石灰岩沉积。它是四川天然气储集的主要层段。其特征是:岩性较纯,厚度较大,主要由巨厚的石灰岩、自云岩及泥灰岩、泥质白云岩组成。 2.蒸发海盆相碳酸盐沉积。目前以气为主,也见到一些油流。其特征是:岩性较杂, Geological and geophysical characteristics of various types of reservoirs in Sichuan I. Overview of strata Sichuan strata can be broadly divided into the following four types. 1. Marine limestone sediments. It is the main section of Sichuan’s natural gas reserves. The utility model is characterized in that the lithology is relatively pure and has a large thickness and is mainly composed of thick limestone, dolomite, marl and argillaceous dolomite. Evaporation of marine carbonate deposition. At present the main gas, but also to see some oil flow. Its characteristics are: lithology is more complex,