四川盆地中二叠统茅口组天然气勘探
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摘要
四川盆地的茅口组具有阳新统和志留系两套较好的生油层,是盆地的主要产气层之一。储集空间为孔、洞、缝,特别是东吴运动后产生的表生期古岩溶形成的溶蚀洞穴,在茅口组既多且大,在泸州古隆起区已于99口井中钻遇,钻遇率为9.94%,加上井中重复钻遇,钻遇率达11.35%。放空厚度一般在0.1～1.0m之间,最厚可达3.95m,并不受构造和地域限制,即使是向斜也有放空,勘探领域远较构造圈闭宽广。经开发证实,古岩溶气藏累计采气较好,连通裂缝气藏一般皆好,古岩溶形成的缝洞网络与连通裂缝形成的网络相互交织则最好,应加强地震反射资料的研究,以寻找这种网络系统。
Maokou Formation is one of the major pay zones of Sichuan Basin, in which there are Yangxin Series and Silurian potential source rock. Cracks,pores, and caves are dominant reservoir space of the Formation. In particular, corrosion caves developed from surface Palaeokarst generated after DongwuMovement are widely distributed in the Formation. Now 99 wells have been drilled in Luzhou Paleouplift area, with the ratio drilled being 9.94% and evenreaching as high as 11.35% thanks to repeated borehole drilling. Without the limit of region and structure, venting thickness ranges from 0.1m to 1.0m, withthe maximum reaching 3.95m. Venting also exists in synclines, of which the exploration area is more extensive than that of structural traps. Developmentshows that it is better to cumulatively produce gas in Palaeokarst reservoirs which are well connected with fractured gas reservoirs. Networks consisting ofPalaeokarst pores and caves interweave with networks developed from the connection between Palaeokarst reservoirs and fractured gas reservoirs. The interweaving is the best. So research on seismic reflection data should be intensified to find out such types of network systems.
Maokou Formation is one of the major pay zones of Sichuan Basin, in which there are Yangxin Series and Silurian potential source rock. Cracks,pores, and caves are dominant reservoir space of the Formation. In particular, corrosion caves developed from surface Palaeokarst generated after DongwuMovement are widely distributed in the Formation. Now 99 wells have been drilled in Luzhou Paleouplift area, with the ratio drilled being 9.94% and evenreaching as high as 11.35% thanks to repeated borehole drilling. Without the limit of region and structure, venting thickness ranges from 0.1m to 1.0m, withthe maximum reaching 3.95m. Venting also exists in synclines, of which the exploration area is more extensive than that of structural traps. Developmentshows that it is better to cumulatively produce gas in Palaeokarst reservoirs which are well connected with fractured gas reservoirs. Networks consisting ofPalaeokarst pores and caves interweave with networks developed from the connection between Palaeokarst reservoirs and fractured gas reservoirs. The interweaving is the best. So research on seismic reflection data should be intensified to find out such types of network systems.
引文
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王世谦、陈盛吉、陈宗清等,四川盆地油气资源评价,四川石油管理局,2002。
王乃举,中国天然气开发图集(第四分册),中国石油天然气总公司,1992。
余明清,川南矿区1995年油气勘探地质工作年报,四川石油管理局,1995。
[2]包茨.天然气地质学[M].北京:科学出版社,1988:197～198
[3]刘宝.沉积岩石学[M].北京:地质出版社,1980:424～430
[4]陈宗清.鄂西利川复向斜南部石炭系—三叠系储层与评价[J].海洋石油,2002,114(4):24～31
[5]黄籍中,张子枢.四川盆地阳新统天然气的成因[J].石油勘探与开发,1982,9(1):12～25
[6]程耀黄,陈盛吉.四川盆地气源与勘探[J].天然气工业,1982,2(1):27～34
[7]陈宗清.川东石炭系气藏形成条件[J].石油学报,1982,3(1):23～28
[8]罗志立.中国西南地区晚古生代以来地裂运动对石油等矿产形成的影响[J].四川地质学报,1981,2(1):1～22
[9]陈宗清.试论碳酸盐岩断层圈闭油气藏地质条件——川东石炭系断层圈闭油气藏勘探实践[J].地质论评,1986,32(4):374～383
[10]刘仲宣,夏绍文.川西南地区二叠系阳新统有效裂缝分布规律与布井方法探讨[J].天然气工业,1991,11(3):1～22
[11]陈宗清.川西南地区二、三叠系碳酸盐岩断带裂缝气藏[J].石油学报,1995,16(3):37～42
[12]朱世新,王定一,宋芝祥.油气调查勘探与资源评价[M].成都:成都地质学院出版社,1983:66～67
王世谦、陈盛吉、陈宗清等,四川盆地油气资源评价,四川石油管理局,2002。
王世谦、陈盛吉、陈宗清等,四川盆地油气资源评价,四川石油管理局,2002。
王乃举,中国天然气开发图集(第四分册),中国石油天然气总公司,1992。
余明清,川南矿区1995年油气勘探地质工作年报,四川石油管理局,1995。
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