准噶尔盆地东南缘芦草沟组页岩气地质特征

发布时间：2018-06-13 12:15

  本文选题：准噶尔盆地 + 页岩气　； 参考：《成都理工大学》2017年硕士论文

【摘要】：论文以准噶尔盆地东南缘中二叠统芦草沟组黑色页岩为研究对象,在前人研究基础上,通过路线调查、剖面实测,并结合钻井资料及样品分析测试数据,系统研究了芦草沟组黑色页岩的沉积特征、生烃特征、储集特征以及含气性特征等页岩气地质特征,并取得了以下成果和认识:根据内芦草沟组下、中、上三段纵向上的岩性、岩相变化规律以及沉积相特征,认为研究区芦草沟组自下而上整体呈现为扇三角洲-半深湖-深湖环境下的水体扩张加深的过程。博格达地区既为沉积中心也为沉降中心。有机地化方面,芦草沟组富有机质页岩中干酪根类型以Ⅰ型为主,Ⅱ1型次之;TOC含量高,平均可达4.40%;镜质体反射率(Ro)介于0.62%-1.27%之间,平均值0.8%,处于低成熟阶段。储集能力方面,芦草沟组页岩储层的基质孔隙度平均值0.98%,渗透率平均值0.04mD,总体具有特低孔特低渗特征;微观上多发育连通性较差的基质粒间孔隙;结合ZY3井测录井资料,认为芦草沟组页岩气主要储集空间类型为裂缝或微裂缝。脆性度方面,芦草沟组页岩样品的柏松比平均值为0.22,杨氏弹性模量平均值为1.34×104MPa,再结合其交会图,以及X衍射定量测试的脆性指数(66.98%),均反映芦草沟组页岩脆性度高,具有良好的可压裂性。含气性方面,54件样品总含气量平均值为0.39 m3/t,总含气量0.5 m3/t的样品所控制的厚度累计为77m,连续有效厚度25m;而高含气段多为裂缝发育段,受TOC含量影响较小;Langmuir等温吸附试验显示芦草沟组页岩具有较强的吸附能力。通过分析研究,总结出研究区芦草沟组页岩气富集主控因素,其中有利因素:芦草沟组富有机质页岩发育于半深湖-深湖相、连续有效厚度大、TOC含量高、储集能力强;不利因素:热成熟度较低、构造复杂且断裂较发育。初选乌鲁木齐向斜为研究区芦草沟组页岩气勘探有利区。
[Abstract]:In this paper, the black shale of Lucaogou formation of Middle Permian in the southeastern margin of Junggar Basin is taken as the research object. On the basis of previous studies, through route investigation, profile measurement, and combined with drilling data and sample analysis test data, The sedimentary characteristics, hydrocarbon generation characteristics, reservoir characteristics and gas-bearing characteristics of the black shale of the Lucaogou formation are systematically studied, and the following results and understandings are obtained: according to the longitudinal lithology of the lower, middle and upper third member of the inner Lucaogou formation, The lithofacies variation law and sedimentary facies characteristics suggest that the Lucaogou formation in the study area presents a process of water expansion and deepening from bottom to top in the environment of fan delta-semi-deep lake and deep lake. The Bogda area is a sedimentation center as well as a sedimentation center. In organic geochemistry, the kerogen types in organic shale of Luchaogou formation are mainly type 鈪，

本文编号：2013995