长宁区块下古生界龙马溪及筇竹寺组页岩储层特征研究及评价

发布时间：2018-01-06 04:33

  本文关键词：长宁区块下古生界龙马溪及筇竹寺组页岩储层特征研究及评价　出处：《西南石油大学》2017年硕士论文　论文类型：学位论文

  更多相关文章： 筇竹寺组 龙马溪组 页岩气 储集空间类型 微观孔喉结构 储层评价

【摘要】：本文以四川盆地南部长宁地区筇竹寺及龙马溪组页岩为研究对象,在综合总结前人研究成果基础上,利用覆压脉冲孔渗、X射线衍射、X射线荧光、阴极发光、X射线能谱定量分析、氩离子抛光、扫描电镜、高压压汞、低温氮气吸附、核磁共振、岩石力学等实验手段,深入研究筇竹寺及龙马溪组页岩孔渗特征、矿物组成、有机碳含量、孔缝类型及发育特征、储集空间类型、孔分布特征等,最终完成了储层评价参数的选取和主控因素的探讨,主要取得了以下成果:(1)从区域地质概况、岩石学特征、有机质丰度、物性特征等四个方面对长宁区块筇竹寺及龙马溪组泥页岩储层进行综合研究,并与安徽芜湖区块二叠系及志留系等多套页岩储层和北美典型页岩储层进行对比,发现三者之间具有一定的相似性。(2)页岩储集空间包括裂缝和基质孔隙两大类,按照成因来源可将基质孔隙区分为:无机孔、有机质孔和生物成因孔;裂缝根据构造成因可分为:原生缝和次生缝。其中龙马溪组页岩中有机质孔、粘土矿物层间微孔及粒间微孔发育;筇竹寺组粘土矿物层间微孔、粘土矿物微晶间孔、有机质孔及颗粒内微溶孔发育。(3)长宁区块龙马溪组页岩孔隙度分布在1.84～9.10%之间,平均为4.07%,主要分布在2～6%之间;渗透率分布在1.75～1250nD之间,平均为90.83nD,主要分布在1～50nD之间。筇竹寺组页岩的物性比龙马溪组差得多,平均孔隙度仅为1.446%,渗透率相比也低很多,表现出极强的非均质性。(4)龙马溪及筇竹寺组高压压汞曲线分别为极细歪度分选差型及中歪度分选差型,退汞效率极低,压汞参数反应出页岩具有孔喉小及分选差的特点;与此同时,两组地层页岩吸附曲线均为Ⅱ型吸附等温线,具有缝状的孔隙结构特征。就吸附参数对比而言,龙马溪组比表面值、孔容均较高,筇竹寺组相对较低,且发现泥页岩比表面值与碳酸盐矿物及TOC含量有一定的相关性。(5)综合低温氮气吸附、核磁共振、高压压汞三种方法的优缺点,建立了较精确测试泥页岩孔径分布的方法,发现龙马溪组泥页岩微孔十分发育,占59.38%,大孔孔较发育,占38.24%,中孔极不发育;筇竹寺组泥页岩大孔发育,占83.66%,微孔及中孔极不发育,仅占16.34%,这可能是导致吸附气少的重要因素。(6)储层评价筛选的参数为孔隙度、渗透率、TOC以及脆性矿物含量,并制定了分类标准,评价结果为龙马溪组页岩为较好的储层,筇竹寺组页岩为非储层。经分析认为,有机质、脆性矿物含量、粘土矿物含量及微孔的发育程度是形成优质页岩储层的重要因素。
[Abstract]:In this paper, the shale of Qiongzhusi and Longmaxi formation in Changning area of southern Sichuan Basin is taken as the research object. On the basis of synthetically summarizing the previous research results, X-ray fluorescence and cathodoluminescence are obtained by X-ray diffraction and cathodoluminescence. X-ray energy dispersive analysis, argon ion polishing, scanning electron microscope, high pressure mercury pressure, low temperature nitrogen adsorption, nuclear magnetic resonance, rock mechanics and other experimental means, in-depth study of shale permeability characteristics of Qiongzhusi and Longmaxi formation. Mineral composition, organic carbon content, pore fracture type and development characteristics, reservoir space type, pore distribution characteristics and so on, finally completed the selection of reservoir evaluation parameters and main control factors. The main achievements are as follows: (1) the shale reservoirs of Qiongzhusi and Longmaxi formation in Changning area are studied synthetically from four aspects: regional geological survey, petrological characteristics, abundance of organic matter and physical properties. It is compared with several sets of shale reservoirs such as Permian and Silurian systems in Wuhu block Anhui Province and typical shale reservoirs in North America. It is found that there is a certain similarity among the three types. The shale reservoir space includes two types: fracture and matrix pore. According to the origin source, the matrix pore can be divided into inorganic pore, organic pore and biogenic pore; The fractures can be divided into primary and secondary fractures according to their tectonic origin, in which organic pore, interlaminar micropore and intergranular micropore are developed in the shale of Longmaxi formation; The porosity of the shale of Longmaxi formation in Changning block is between 1.84% and 9.10%. The average value was 4.07, mainly between 2% and 6%. The permeability distribution is between 1.75 and 1250nD, with an average of 90.83nD, mainly in the range of 110nD. The physical properties of Qiongzhusi formation shale are much worse than those of Longmaxi formation. The average porosity is only 1.446 and the permeability is much lower. The high pressure mercury injection curves of Longmaxi and Qiongzhusi formation are very fine deviation type and middle skew type respectively, and the efficiency of mercury removal is very low. Mercury injection parameters show that shale has the characteristics of small pore throat and poor sorting. At the same time, the adsorption curves of the two groups of shale are type 鈪，

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