川西前陆盆地南段须二段有利成岩相研究
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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.
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.
引文
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[10]陈尘,韩嵩.川西南部须家河组勘探潜力再评价[J].天然气勘探与开发,2016,39(3):11-15.
[2]张鼎,田作基,吴胜华,等.川西须家河组储层成岩演化[J].岩石学报,2008,24(9):2 179-2 184.
[3]胡明毅,李士祥,魏国齐,等.川西前陆盆地上三叠统须家河组沉积体系及演化特征[J].石油天然气学报,2008,30(5):5-10.
[4]周文,戴建文.四川盆地西部坳陷须家河组储层裂缝特征及分布评价[J].石油实验地质,2008,30(1):20-25.
[5]杜业波,季汉成,朱筱敏.川西前陆盆地上三叠统须家河组成岩相研究[J].吉林大学学报:地球科学版,2006,36(3):358-364.
[6]蒋裕强,刁昱翔,王猛,等.川西南部须二段储层成岩作用与成岩相研究[J].矿物岩石地球化学通报,2014,33(4):509-516.
[7]邹才能,陶士振,周慧,等.成岩相的形成、分类与定量评价方法[J].石油勘探与开发,2008,35(5):526-540.
[8]连丽霞,尹太举,王磊,等.晚三叠世川西前陆盆地形成及沉积充填[J].石油天然气学报,2011,33(3):12-17.
[9]刘柏,张豫,杨华,等.苏码头构造须二段储集层特征及勘探方向[J].天然气技术与经济,2015,9(5):10-14.
[10]陈尘,韩嵩.川西南部须家河组勘探潜力再评价[J].天然气勘探与开发,2016,39(3):11-15.