赣东北古生界3套富有机质页岩的岩矿特征及意义
发布时间：2018-03-28 00:07
本文选题：赣东北 切入点：古生界 出处：《中国矿业大学学报》2017年01期
【摘要】：查明下扬子古生界富有机质页岩的矿物组成特征,对页岩储层矿物组成影响页岩气储集、渗流运移和开采效果进行了研究.应用XRD、扫描电镜、低温液氮和储层敏感性实验系统分析了赣东北上震旦统皮园村组(Z_2p)、下寒武统荷塘组(∈_1h)和上二叠统乐平组(P_3l)3套海相页岩的矿物组成特征.认为3套页岩样品黏土矿物中伊利石含量均占绝对优势,高岭石含量少,表明已经历晚成岩阶段;沉积环境为碱性水介质起控制作用的深水陆棚沉积环境,这种相对还原的沉积环境为页岩气藏的形成与演化提供了良好的沉积条件;3套页岩矿物脆性指数高,整体上具有良好的储层可改造性,有利于实施页岩气的压裂改造,与北美和国内上扬子地区相比,研究区为理想的页岩气重点勘探开发层位.研究结果表明:3套页岩矿物成分均以石英占主要优势(质量分数为46.73%~64.81%),其次为黏土矿物,同时还普遍含有方解石、白云石、菱铁矿和黄铁矿等矿物;3套富有机质页岩的黏土矿物组成都以伊利石的质量分数为最高(74.58%~87.00%),其次为伊/蒙间层矿物(6.44%~20.58%).皮园村组、荷塘组、乐平组脆性指数平均值分别为67.35,77.90和48.95,易于压裂.矿物成分中石英主要影响宏孔的发育,有利于页岩气的渗流和运移,但黏土矿物控制微孔的发育并与孔隙度和渗透率呈负相关关系,有利于页岩气的保存但不利于渗流;皮园村组和荷塘组页岩储层敏感性不明显,乐平组具有中等偏弱速敏、中等偏强水敏和中等偏弱酸敏效应.理想的页岩气重点勘探开发层位次序可定为荷塘组皮园村组乐平组,页岩气开发工艺应根据其矿物组成的变化在不同区域分别对待.
[Abstract]:Find out the Paleozoic organic rich shale mineral composition characteristics of shale reservoir mineral composition of shale gas reservoir seepage effect set, migration and exploitation effect were studied. The application of XRD, scanning electron microscopy, N2 and reservoir sensitivity analysis of the experimental system of Dan Garden Village on the Northeast Jiangxi skin shock (Z_2p), under the Cambrian Hetang formation (_1h) and two middle Jurassic Leping formation (P_3l) composition of 3 sets of marine shale mineral. The content of illite 3 shale samples of clay minerals were dominated, the content of kaolinite, showed that the late diagenetic stage experienced; sedimentary environment control for alkaline water medium the deep water shelf sedimentary environment provides good conditions and sedimentary evolution of the sedimentary environment of the relative reduction of shale gas reservoir formation; 3 sets of shale mineral brittleness index is high, the whole has good reservoir can be made of, is conducive to the implementation of 椤靛博姘旂殑鍘嬭鏀归，
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