川西南部地区沙溪庙组储层特征及其控制因素研究

发布时间：2018-04-29 23:39

  本文选题：川西南部地区 + 沙溪庙组　； 参考：《西南石油大学》2015年硕士论文

【摘要】：川西南部地区侏罗系沙溪庙组气藏为典型的低孔低渗致密砂岩次生气藏,是川西地区侏罗系浅层气勘探的重要领域之一。通过多年的勘探,先后发现了苏码头、白马庙、观音寺等多个气藏,展示了川西南部地区沙溪庙组良好的勘探前景,因此深入研究该区沙溪庙组储层特征及其控制因素具有重要意义。本次论文在结合前期研究成果基础上,运用沉积学、矿物岩石学、储层地质学等相关理论及方法,对川西南部地区沙溪庙组物源特征、砂体展布特征、储层特征及储层发育控制因素进行分析。 研究认为川西南部地区沙溪庙组沉积受到两大物源影响,主要是龙门山中-南段方向的西北物源和母岩具有差异的龙门山中-北段与米仓山-大巴山共同影响的北部物源。研究区主要发育河流和三角洲沉积,其中三角洲类型是以分流河道为主体的分支河道型浅水三角洲。研究区储层岩性主要为细粒～中粒的长石砂岩和岩屑长石砂岩,储层物性表现为低孔低渗特征,储集空间主要为残余粒间孔和长石溶孔。储层发育受到多种因素影响,沉积作用对储层的影响表现在物源和沉积微相的差异上,储层一般发育在长石含量高的砂岩或厚层的分流河道砂岩中；压实作用和钙质胶结作用是使砂岩致密的重要原因,溶蚀作用或绿泥石环边胶结发育的砂岩溶蚀孔隙或残余粒间孔隙发育；构造作用对该区储层孔渗的改善和次生气藏的形成具有重要意义。根据钻井显示、试油成果以及测井解释成果等资料,认识了沙溪庙组储层分布规律。沙溪庙组储层纵向上主要分布在沙Ⅱ段、沙Ⅲ段和沙Ⅳ段,储层平面分布受到物源影响和沉积微相控制,主要分布在东部苏码头、盐井沟等受到北部物源影响的三角洲分流河道砂体中。 在认识储层特征、储层发育控制因素和储层分布规律基础上,提出有利储层分布区评选原则。结合现有钻井和测井资料,选择出沙溪庙组重点层段—沙Ⅱ段和沙Ⅲ段的有利储层分布区。
[Abstract]:The Jurassic Shaximiao formation gas reservoir in the southern part of Sichuan is a typical low porosity and low permeability tight sandstone secondary gas reservoir, which is one of the important fields of Jurassic shallow gas exploration in western Sichuan. After many years of exploration, many gas reservoirs, such as Su Wharf, Bai Ma Miao, Guanyin Temple and so on, have been discovered, showing a good prospect for exploration of the Shaximiao formation in the southern part of West Sichuan. Therefore, it is of great significance to study the reservoir characteristics and controlling factors of Shaximiao formation in this area. On the basis of previous research results, this paper applies the theories and methods of sedimentology, mineralogy and petrology, reservoir geology, etc. to analyze the characteristics of source material and distribution of sand bodies in Shaximiao formation in the south of Sichuan. Reservoir characteristics and reservoir development control factors were analyzed. It is considered that the deposition of Shaximiao formation in the southern part of Sichuan is influenced by two major provenances, mainly the northwestern provenance in the direction of the mid-south segment of the Longmen Mountains and the northern provenance of the central to northern segment of Longmen Mountain and the Mecang Mountain to the Daba Mountains, which are different from the parent rocks. Rivers and deltas are mainly developed in the study area, among which the deltas are shallow-water deltas dominated by distributary channels. The reservoir lithology in the study area is mainly composed of fine to medium grain feldspar sandstone and lithic feldspar sandstone. The reservoir physical properties are characterized by low porosity and low permeability, and the reservoir space is mainly composed of residual intergranular pore and feldspar solution pore. The reservoir development is affected by many factors. The influence of sedimentation on reservoir is the difference between provenance and sedimentary microfacies, and the reservoir is generally developed in sandstone with high feldspar content or distributary channel sandstone with thick layer. Compaction and calcareous cementation are the important reasons for the densification of sandstone. The dissolution or the formation of residual intergranular pores in sandstone developed by chlorite ring-edge cementation; Tectonism is of great significance to the improvement of reservoir porosity and permeability and the formation of secondary gas reservoirs. According to the data of drilling, oil test and log interpretation, the reservoir distribution law of Shaximiao formation is recognized. The reservoir of Shaximiao formation is mainly distributed in the Shahejie 鈪，

本文编号：1822113