川西前陆盆地南段须二段有利成岩相研究  

Favorable Diagenetic Facies of Xujiahe 2 Member, Southern Part of Western Sichuan Foreland Basin

作　　者：曾琪 马华灵 王旭丽 李荣容 李梅 李秀华[2] 夏文杰 

机构地区：[1]中国石油西南油气田公司川西北气矿,四川江油621700 [2]成都理工大学能源学院,四川成都610059

出　　处：《天然气技术与经济》2018年第2期11-15,共5页Natural Gas Technology and Economy

摘　　要：利用岩屑(心)常规薄片、铸体薄片等资料对川西前陆盆地南段须家河组二段成岩相进行了研究,划分出五大成岩相组合:环边绿泥石—硅质—碳酸盐胶结—溶蚀成岩相、硅质—碳酸盐胶结—溶蚀成岩相(莲花山—张家坪特有)、碳酸盐胶结成岩相、黏土杂基充填成岩相及压实—压溶成岩相。由于受成岩作用强度、矿物成分及含量、沉积环境、温度、压力、埋深等条件影响,致使同一成岩相的物性差异较大。因此,根据面孔率、粒间填隙物成分及含量,并结合物性等资料综合分析,将成岩相进一步细分为有利(Ⅰ类)与不利(Ⅱ类)成岩相,其结果与物性符合率在89%以上。在此基础上结合裂缝发育情况将该区储层划分为3类,邛崃—蒲江—雅安一带为优质储层发育区,其结果与勘探实践基本吻合。Based on thin-section and casting thin-section identification, the diagenetic faceis of Xujiahe 2 Member, southern part of Western Sichuan Foreland Basin, can be divided into five types:(1)rimmed cholortie — silicalite — carbonate cement — dissolution,(2) silicalite — carbonate cement — dissolution(special for Zhangjiaping — Lianhuashan area),(3) carbonate cement,(4) clay matrix, and(5) compaction — pressure solution. The same diagenetic facies have obviously various physical properties because of the effect on diagenetic types and strength, mineral composition and content, depositional setting, temperature, pressure, and burial depth. Moreover, according to plane porosity, composition and content of intergranular material, and physical property, the diagenetic facies can be also subdivided into type I(favorable one) and type II(unfavorable one). The coincidence between the subdivided results and physical property is over 89 %. In addition, the Xujiahe 2 Member can be classified into three types based on fracture development, in which Qionglai-Pujiang-Ya'an area should be one developed with high-quality reservoirs. And this conclusion is roughly identical to some exploration activities.

关 键 词：川西前陆盆地南段 须家河组二段 储层特征 成岩相 有利储集相带 

分 类 号：P618.13[天文地球—矿床学]