
第38卷第2期 2017年4月
文章编号:1001-3873(2017)02-0176-06
新疆石油地质
XINJIANG PETROLEUM GEOLOGY DOI:10.7657/XJPG20170210
Vol. 38,No.2 Apr.2017
城口地区鲁家坪组页岩储集特征及含气性影响因素
崔楠1.2.张烨1.2,陆朝晖1.2
(1.重庆地质矿产研究院a国土资源部页岩气资源勘查重点实验室;b.重庆市页岩气资源与勘查工程技术研究中心,
重庆400042;2.油气资源与探测国家重点实验室重庆页岩气研究中心,重庆400042)
摘要:对渝东北城口地区下寒武统鲁家坪组页的地球化学特征、岩石矿物学特征、储集层物性特征、储集空间特征、含气性和保存条件以及页岩含气性的影响因素进行了分析后认为,研究区鲁家坪组页岩保存条件良好,有机质含量高,成熟度高,干酪根以I型为主,页岩脆性高;储集空问以矿物粒间孔隙为主,储集层大孔较发育,单位受附气量大,但由于渝东北域口地区鲁家评组地层结构复杂,有机质成熟度过高,这些不利因素可能会加大后期开发的难度。关键词:渝东北;城口地区;下寒武统;鲁家坪组;页岩;储集层;含气性;灰色关联
中图分类号:TE132.2
文献标识码:A
Shale Reservoir Characteristics and Influencing Factors on Shale Gas Content in Lujiaping
Formation of Chengkou Area CUI Nan'2, ZHANG Ye'2, LU Zhaohui'?
(1.Chongqing Institute of Geology and Mineral Resources, a.Key Laboratory of Shale Gas Resource & Exploration, Ministry of Land and Resources; b.Chongqing Shale Gas Research Center and State Key Laboratory of Petroleum Resource and Prospecting, Chongqing 400042,
China; 2.Chongqing Engineering Research Center and Shale Gas Resourees and Exploration, Chongqing 400042, China)
Abstract: The paper analyzes the characteristics of geochemistry, petromineralogy, reservoir physical properties and reservoir spaces, gas bearing properties and preservation conditions for the shales of the Lower Cambrian Lujiaping formation in Chengkou area of northeasterm Chongqing, and performs correlation analysis of the factors influencing shale gas content with grey correlation theory. The results show that the preservation of the shales in Lujiaping formation is quite good in the study area. The shale reservoir has high organic matter content and maturity and high brittleness, whose kerogen is dominated by Type I; the reservoir spaces are dominated by intergranular pores and large pores are developed in the reservoir with large unit absorbing capacity. But the unfavorable factors such as complicated stratigraphic struc-tures and very high maturity of organic matters of the shales of the Lower Cambrian Lujiaping formation in Chengkou area of northeasterm Chongqing may result in the difficulties for future development.
Keywords: northeastern Chongqing; Chengkou area; Lower Cambrian; Lujiaping formation; shale; reservoir; gas bearing property; grey cor
relation
页岩气的勘探开发始于北美-,中国的页岩气开发在四川盆地焦石坝地区取得了一定成效。渝东北城口地区地层相对复杂,勘探开发难度较大,因此,有必要进一步分析城口地区下集武统鲁家坪组的地质地化条件和其含气性影响因素,对其探勘前景进行评价。本文主要从页岩的地球化学特征、岩石矿物学特征、储集性、含气性以及保存条件等方面,对研究区下赛武统鲁家坪组页岩进行研究,并采用灰色关联理论对影响页岩含气性的各因素进行分析,对鲁家坪组页岩的储集层特征和勘探潜力进行评价。
区域地质概况
渝东北地区大巴山冲断带位于上扬子地块北缘,处于四川盆地与秦岭造山带的过渡部位,整体为一向
收稿日期:2016-10-09
修订日期:2016-12-14
南西凸出的弧形构造带,以城口断裂为界,可划分为南大巴山前陆冲断褶皱带和北大巴山逆冲推覆构造带2个构造单元。研究区位于城口断裂以北、月河断裂以南,属于秦岭地槽褶皱系。
寒武纪,大巴山地区在震旦纪发育的海槽基础
上,自南向北海授,下寒武统下部均发育了套厚度达数百米的富有机质的泥页岩,后经多期次构造运动,秦岭地槽于印支运动最终褶皱回返。北大巴山处于地槽区,缺失泥盆纪、石炭纪和二叠纪的沉积建造,仅在局部地区见三叠系、白垩系及第四系陆相地层不整合于寒武系之上,伴随强烈的构造变形与岩浆活动,地层普遍发生区域变质作用;南大巴山在中三叠世以来,在扬子地块与华北地块的碰撞拼合及扬子向秦岭的巨大陆内俯冲作用之下,形成晚三叠世一早白
基金项目:重庆市国土资源和房屋管理局科技计划项目(KJ-2015038)
作者简介:崔楠(1988-),女,河北安国人,助理工程师,硕士,油气田开发,(Tel)15810427600(E-mail)326522556@qq-com 万方数据