东胜气田上古生界有利储层控制因素研究

发布时间：2018-05-17 08:33

本文选题：东胜气田 + 成岩作用　；参考：《中国石油大学(华东)》2015年硕士论文

【摘要】：本文以东胜气田上古生界储层为研究对象,通过岩石普通薄片观察、铸体薄片鉴定和扫描电镜等分析测试手段,结合粘土矿物分析、全岩矿物分析和压汞测试分析等分析测试结果,对东胜气田上古生界储层的岩石学特征、孔喉结构和物性特征进行详细的描述和分析比对,分析了成岩作用及其成岩演化过程,并结合沉积作用和构造作用对储层物性的影响因素进行分析探讨,明确了储层物性的控制因素。以研究区的铸体薄片为研究对象,结合室内各种分析测试成果,明确了不同地层的储层基本特征。太原组和山1段石英含量高,岩性主要为亚岩屑砂岩,孔隙以剩余粒间孔为主。山2段和下石盒子组长石和岩屑的含量较高,主要为岩屑砂岩、亚岩屑砂岩和长石质岩屑砂岩,含有较多高岭石,长石和高岭石在伯尔江海子断裂北部的含量远高于断层南部,孔隙以次生溶蚀孔隙和晶间孔为主。孔隙度主要为4~18%,而渗透率则主要为0.1~10×10-3μm2,为中孔低渗储层。总体呈现北部物性好,南部较差的特点。成岩作用发育压实压溶作用、含铁碳酸盐胶结交代作用、硅质和粘土矿物(高岭石、伊利石和绿泥石)胶结作用等。北部高岭石含量高,溶蚀作用强,成岩阶段处于中成岩A2段,南部压实强、石英自生加大发育,成岩阶段处于中成岩B阶段。分析认为研究区南部可能发生高岭石和钾长石反应转化为伊利石的作用,因而断层南部长石和高岭石的含量都明显低于断层北部。分别对山1段、太原组和山2段、下石盒子组分析物性控制因素。山1段和太原组压实作用为主要减孔因素,粒度和物性有较好的相关性,粗粒及含砾粗砂岩具有较好的物性。山2段和下石盒子组沉积微相均以辫状河河道和水下分流河道物性最好,南部主控因素为粒度,粗砂岩具有较好的物性,北部主控因素为成岩作用,溶蚀作用强烈的区域物性较好。综合考虑储层的物性、孔喉特征、微观特征和岩性,研究区上古生界储层划分为优质储层、较好储层、一般储层和远景储层。盒一段、盒二段和盒三段优质储层有利区面积相对较大,山西组和太原组优质储层有利区带面积相对较小。太原组和山1段主要发育较好储层。山2段和下石盒子优质储层主要发育于断层北部,断层南部局部发育优质储层。
[Abstract]:In this paper, the upper Paleozoic reservoir of Dongsheng gas field is taken as the research object. Through the observation of ordinary thin sections of rock, the identification of casting thin sections and the scanning electron microscope, the paper combines the analysis of clay minerals. The petrological characteristics, pore throat structure and physical properties of Upper Paleozoic reservoirs in Dongsheng Gas Field are described and compared in detail, and the diagenesis and diagenetic evolution process are analyzed. Combined with sedimentation and tectonism, the influencing factors of reservoir physical properties are analyzed and discussed, and the controlling factors of reservoir physical properties are clarified. The basic reservoir characteristics of different strata are defined by taking the casting thin section of the study area as the research object and combining with the indoor analysis and test results. The quartz content of Taiyuan formation and Shan 1 member is high, the lithology is mainly sublithic sandstone, and the pore is mainly residual intergranular pore. The content of rock and lithic rocks in Shan2 formation and Lower Shihezi formation are relatively high, mainly lithic sandstone, sublithic sandstone and feldspathic lithic sandstone, which contain more kaolinite. The content of feldspar and kaolinite in the northern part of the Berjianghaizi fault is much higher than that in the southern part of the fault. The pores are mainly secondary dissolution pores and intergranular pores. The porosity is 4 ~ (18) and the permeability is 0.1 ~ 10 脳 10 ~ (-3) 渭 m ~ (2), which is a medium porosity and low permeability reservoir. In general, the physical properties of the north are good and the south is poor. The diagenesis developed compaction pressure dissolution, iron carbonate cementation and metasomatism, siliceous and clay minerals (kaolinite, Illite and chlorite) cementation. The content of kaolinite in the north is high, the dissolution is strong, the diagenetic stage is in the middle diagenetic A2 section, the southern part is compacted strongly, the quartz is growing in itself, and the diagenetic stage is in the middle diagenetic stage B. It is considered that the reaction between kaolinite and potassium feldspar may be transformed into Illite in the southern part of the study area, so the contents of feldspar and kaolinite in the southern part of the fault are obviously lower than those in the northern part of the fault. The controlling factors of physical properties were analyzed for Shan 1, Taiyuan and Shan 2, and Lower Shihezi formation, respectively. The compaction of Shan 1 member and Taiyuan formation is the main factor of reducing pore size and physical properties. The coarse grain and gravel coarse sandstone have better physical properties. The sedimentary microfacies of Shan 2 member and Lower Shihezi formation are the best in braided river channel and underwater distributary channel, the main controlling factors in the south are granularity, the coarse sandstone has better physical property, and the diagenesis is the main controlling factor in the north. The region with strong dissolution has better physical properties. Considering the physical properties, pore throat characteristics, microcosmic characteristics and lithology, the Upper Paleozoic reservoirs in the study area are divided into high quality reservoirs, better reservoirs, general reservoirs and prospective reservoirs. The favorable area of high quality reservoir is relatively large in the first member, the second member and the third member, and the area of favorable zone is relatively small in Shanxi formation and Taiyuan formation. Taiyuan formation and Shan 1 member are mainly well developed reservoirs. The high quality reservoirs in Shan2 and Xiashihezi are mainly developed in the northern part of the fault, and the high quality reservoirs are developed locally in the southern part of the fault.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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