鄂尔多斯盆地志丹—甘泉地区延长组长7段页岩油及页岩气成藏条件研究

发布时间：2018-01-20 16:36

  本文关键词： 富有机质泥页岩 陆相页岩油气 成藏条件 长7油层组 志丹—甘泉地区　出处：《西安石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：对比北美页岩油气成藏地质条件发现,鄂尔多斯盆地三叠系延长组长7段发育一套品质很好的泥页岩,具有一定的页岩油气形成条件,但是对页岩油气的成藏条件、分布规律以及评价标准、参数选取等问题有待深入认识。本论文通过岩心观察、薄片鉴定、物性测试、有机地球化学测试、X衍射等分析测试结果,结合沉积、测井、录井等资料及前人的研究成果,对鄂尔多斯盆地志丹—甘泉地区三叠系延长组长7段陆相泥页岩的成藏条件进行了分析,得到以下成果和认识:延长组长7段泥页岩主要为半深湖—深湖沉积,厚度由西南向东北逐渐变薄,连续性较好且分布稳定,厚度大的地区位于盆地的沉积中心;有机碳含量高,84.2%的样品大于2%,平均值为4.61%,有机质热演化处于成熟阶段,Ro主要分布在0.6%~1.1%之间,处于生油窗内,干酪根类型以I-II1型为主;泥页岩粘土矿物含量高,岩心样品平均值为56.3%,以伊蒙混层和伊利石为主,且石英、长石、碳酸盐矿物等含量低;储层孔隙度平均为3.34%,基质渗透率平均为0.033×10-3μm2;微观储集空间类型包括泥质粒间孔、粒内孔、有机质孔及微裂缝,其中有机质孔相对不发育;泥页岩的兰氏体积在0.56m3/t~4.43m3/t之间,有机碳含量和粘土矿物(主要是伊利石)含量是影响泥页岩吸附能力的最重要因素;通过热成熟度与油气两相存在的最大埋深关系公式,判断出志丹以南,甘泉以西存在油气两相态。在综合考量泥页岩厚度、有机质丰度、成熟度以及粘土矿物含量等参数的基础上,建立了研究区富有机质泥页岩储层评价指标,对研究区长7段页岩油气的有利勘探区域进行预测,确定出研究区内Ⅰ类和Ⅱ类有利区。
[Abstract]:In contrast with North American shale reservoir forming geological conditions, it is found that a set of shale with good quality is developed in member 7 of the Triassic Yanchang formation in Ordos Basin, which has certain conditions for the formation of shale oil and gas. However, the conditions of shale oil and gas accumulation, distribution, evaluation criteria, parameter selection and other issues need to be deeply understood. This paper through core observation, thin section identification, physical properties testing, organic geochemical testing. X-ray diffraction analysis and test results, combined with deposition, logging, logging and other data and previous research results. Based on the analysis of the reservoir forming conditions of the terrigenous shale in the 7th member of the Chang Yanchang formation of the Triassic Yanchang formation in the Zhidan-Ganquan area, Ordos Basin, the following results and understandings have been obtained: the shale shale of the formation Yanchang is mainly semi-deep lacustry-deep lake deposition. The thickness is gradually thinned from southwest to northeast, and the continuity is good and the distribution is stable. The area with large thickness is located in the sedimentary center of the basin. The samples with high organic carbon content (84.2%) are larger than 2 (average value is 4.61). The organic matter thermal evolution is mainly distributed between 0.6% and 1.1% in the mature stage and in the oil generation window. The main type of kerogen was I-II1; The content of clay minerals in shale is high, the average value of core samples is 56.3, mainly of immonitic and Illite, and the contents of quartz, feldspar and carbonate minerals are low. The average porosity of reservoir is 3.34 and the average permeability of matrix is 0.033 脳 10 ~ (-3) 渭 m ~ (2); The microreservoir space types include intergranular pore, intergranular pore, organic pore and microfissure, among which the organic pore is relatively undeveloped. The Ranch volume of shale is between 0.56 m3 / t and 4.43 m3 / t, and the content of organic carbon and clay minerals (mainly Illite) are the most important factors affecting the adsorption capacity of shale. Based on the relationship between thermal maturity and the maximum buried depth of oil and gas two phases, it is found that there are two phases of oil and gas to the south of Zhidan and west of Gan Quan. The thickness of shale and the abundance of organic matter are considered synthetically. Based on the parameters of maturity and clay mineral content, the evaluation index of organic matter rich shale reservoir in the study area is established, and the favorable exploration area of shale oil and gas in Chang7 formation is predicted. The favorable regions of class 鈪，

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