石臼坨凸起陡坡带东三段扇三角洲砂体成岩作用定量表征

发布时间：2018-04-04 01:49

本文选题：石臼坨凸起陡坡带　切入点：扇三角洲　出处：《大庆石油地质与开发》2017年06期

【摘要】：为了明确成岩作用对石臼坨凸起陡坡带东三段扇三角洲砂体的控制作用,利用岩心观察、铸体薄片、扫描电镜、阴极发光、岩石物性测试及包裹体等多种资料,分析了研究区砂体成岩演化规律、成岩作用强度和成岩改造孔隙度并利用"反演回剥法"以成岩演化序列为约束,根据铸体薄片中各种自生矿物和溶解孔隙的面积百分比,定量计算压实作用后各期成岩作用强度。研究结果表明:研究区东三段扇三角洲砂体目前处于中成岩B期,成岩演化序列为压实作用→早期碳酸盐胶结→长石、岩屑、碳酸盐胶结物溶蚀/高岭石胶结→石英加大→晚期碳酸盐胶结;压实作用导致目标样品面孔率损失率为34.86%,成岩早期菱铁矿胶结和晚期含铁碳酸盐矿物胶结导致面孔率损失率为12.29%,以高岭石为主的黏土矿物胶结导致面孔率损失率为42.68%,溶蚀作用使得面孔率增加率为22.21%;沉积物源中高刚性颗粒含量有助于原生孔隙的保存,以中酸性火成岩碎屑为主的易溶成分是溶蚀作用发生的主要对象;物源是形成优质储层的先决条件,后期酸性流体对易溶组分的溶蚀有效改善了砂体物性。定量表征成岩演化过程,明确物性差异主控因素并有效恢复砂体孔隙度演化史,对指导渤海海域内深层油气勘探具有重要意义。
[Abstract]:In order to clarify the controlling of diagenesis on shijiutuo uplift steep slope section of East three fan delta sand body, based on the core observation, cast thin section, scanning electron microscope, cathodoluminescence, rock mechanics test and inclusions of various materials, the analysis of the formation of sand rock evolution rules, diagenetic intensity and diagenesis and porosity by back stripping method "to diagenetic evolution sequence constraints, according to the casting area percentage of autogenetic mineral and dissolved pore thin sections, quantitative calculation of compaction after each period of diagenesis intensity. The results show that the study area east three fan delta sand body in the middle B diagenetic stage, diagenetic sequence compaction, carbonate cementation, early feldspar, debris and carbonate cement dissolution / kaolinite cementation, quartz overgrowth and carbonate cementation; compaction caused loss of face sample rate 34.86%, early diagenetic siderite cementation and late carbonate cementation caused porosity loss rate was 12.29% and the cementation of clay minerals kaolinite leads to porosity loss rate is 42.68%, the rate of increase of face dissolution rate was 22.21%; in the sediment source high rigid particle content help the preservation of primary porosity and in acidic igneous rocks clastics soluble composition is the main object of dissolution; provenance is a prerequisite for the formation of high quality reservoir, the acid fluid on the soluble component of the solution can effectively improve the physical properties of sand bodies. The quantitative characterization of the diagenetic evolution process, clear differences between the main control the factors and effective recovery of sand body porosity evolution history, is of great significance to guide the Bohai sea in deep oil and gas exploration.

【作者单位】：中海石油(中国)有限公司天津分公司渤海石油研究院;中海油能源发展股份有限公司工程技术分公司;
【基金】：国家科技重大专项“渤海海域勘探新领域及关键技术研究”(2016ZX05024-003)
【分类号】：P618.13

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