塔里木盆地孔雀河斜坡志留系土什布拉克组储层特征研究
发布时间：2019-03-06 17:33
【摘要】：孔雀河斜坡位于塔里木盆地东北部,是一个介于库鲁克塔格隆起和满加尔坳陷之间,总体呈北东高南西低的过渡斜坡带。区内志留系土什布拉克组是一套致密砂岩储层,尽管具有良好的天然气显示,但由于受到长期的构造演化和多期构造叠加的影响,地质条件复杂,志留系地震资料整体反射品质差,勘探难度较大,前人的研究主要集中在成藏方面,对于储层方面的研究较为薄弱。本文通过对塔里木盆地孔雀河斜坡志留系土什布拉克组的沉积相、储层特征、成岩作用、成岩演化序列等的研究,对土什布拉克组致密砂岩储层进行了分类评价,并从沉积和成岩两方面具体分析了优质储层发育的主控因素。 孔雀河斜坡志留系土什布拉克组为一套发育于无障壁海岸沉积体系中的粗粒砂质辫状河三角洲沉积,主要发育有辫状分流河道、辫状砂坝、水下分流河道、河口坝、水下分流间湾等沉积微相。岩性以岩屑砂岩为主,成分成熟度中等-差,结构成熟度中等-好。成岩作用类型主要为压实作用、胶结作用、溶蚀作用和构造碎裂作用,受构造抬升剥蚀影响成岩演化程度不高,自侏罗纪至今一直处于中成岩阶段A期。 土什布拉克组总体上符合中石化Ⅳ-Ⅴ类储层标准,属于特低孔特低渗-特低孔超低渗型致密砂岩储层,储层类型主要为孔隙型、孔隙-裂缝型,孔隙度与渗透性具明显的正相关关系,但相关性不好,受微裂缝影响较大,具有双介质特征。孔隙类型以溶蚀孔为主,其次为残余原生粒间孔和微裂缝,孔隙总体上表现为细孔细喉-微孔微喉的结构特征,孔喉连通性较差。根据沉积微相与物性和电性的对应关系,可将土什布拉克组致密砂岩储层划分为三种类型。 母岩的性质决定了土什布拉克组储层低孔低渗的基本特点,在此基础上沉积分异作用对储层进行了最初的改造,并通过不同沉积微相类型所对应的物性特征体现出来。沉积分异作用对后期的成岩改造也存在很大影响,原生物性相对较好的储层受建设性成岩作用改造也更为强烈。总体上粒度较粗的岩相所对应的沉积相带整体储集性能要好于细粒岩相所对应的沉积相带,沉积微相是最为主要的控制因素。目前限于地震资料的反射品质,难以对储层进行横向上的预测,随着三维地震的开展和地震分辨率的提高,结合地震资料对该地区砂体展布及储层进行精确预测将成为可能。
[Abstract]:The Kongqihe slope is located in the northeast of Tarim Basin. It is a transitional slope zone between the Kueruktag uplift and the Manchar depression, which is generally high in the north-east and low in the south and west. The Silurian Tushburak formation in the area is a set of tight sandstone reservoirs. Although it has good natural gas indication, the geological conditions are complex due to the influence of long-term tectonic evolution and multi-stage tectonic superposition. The whole reflection quality of Silurian seismic data is poor and exploration is difficult. Previous studies mainly focus on reservoir formation, but the research on reservoir is relatively weak. Based on the study of sedimentary facies, reservoir characteristics, diagenesis and diagenetic evolution sequence of the Silurian Tushburak formation on the Kongqihe slope of Tarim Basin, the tight sandstone reservoirs of the Tushburak formation are classified and evaluated. The main controlling factors for the development of high quality reservoirs are analyzed from both sedimentary and diagenetic aspects. The Silurian Tushbulak formation on the Kongqihe slope is a series of coarse-grained braided river delta deposits developed in barrier-free coastal sedimentary systems, which are mainly composed of braided distributary channels, braided sand dams, underwater distributary channels and estuarine dams. Underwater distributary bay and other sedimentary microfacies. Lithology is dominated by lithic sandstone with moderate-poor composition maturity and medium-good structural maturity. The diagenetic types are mainly compaction, cementation, dissolution and tectonic fragmentation. The evolution degree of diagenetic rocks affected by tectonic uplift and denudation is not high, and it has been in stage A of middle diagenesis since Jurassic. The Tushburak formation generally accords with the class 鈪，
本文编号：2435748
[Abstract]:The Kongqihe slope is located in the northeast of Tarim Basin. It is a transitional slope zone between the Kueruktag uplift and the Manchar depression, which is generally high in the north-east and low in the south and west. The Silurian Tushburak formation in the area is a set of tight sandstone reservoirs. Although it has good natural gas indication, the geological conditions are complex due to the influence of long-term tectonic evolution and multi-stage tectonic superposition. The whole reflection quality of Silurian seismic data is poor and exploration is difficult. Previous studies mainly focus on reservoir formation, but the research on reservoir is relatively weak. Based on the study of sedimentary facies, reservoir characteristics, diagenesis and diagenetic evolution sequence of the Silurian Tushburak formation on the Kongqihe slope of Tarim Basin, the tight sandstone reservoirs of the Tushburak formation are classified and evaluated. The main controlling factors for the development of high quality reservoirs are analyzed from both sedimentary and diagenetic aspects. The Silurian Tushbulak formation on the Kongqihe slope is a series of coarse-grained braided river delta deposits developed in barrier-free coastal sedimentary systems, which are mainly composed of braided distributary channels, braided sand dams, underwater distributary channels and estuarine dams. Underwater distributary bay and other sedimentary microfacies. Lithology is dominated by lithic sandstone with moderate-poor composition maturity and medium-good structural maturity. The diagenetic types are mainly compaction, cementation, dissolution and tectonic fragmentation. The evolution degree of diagenetic rocks affected by tectonic uplift and denudation is not high, and it has been in stage A of middle diagenesis since Jurassic. The Tushburak formation generally accords with the class 鈪，
本文编号：2435748
本文链接：https://www.wllwen.com/kejilunwen/diqiudizhi/2435748.html
