Favorable targets of breakthrough and built-up of shale gas in continental facies in Lower Jurassic, Sichuan Basin
-
摘要: 与北美在海相泥页岩中成功开发的页岩气相比,我国主要含油气盆地中的页岩气是以赋存于陆相沉积岩中为基本特点的,因此陆相层系也是页岩气勘探开发新的重要领域。但陆相与海相页岩中的矿物成分、沉积结构存在一定的差别,与岩石力学性质有关的压裂特征是制约陆相页岩气能否取得有效益的开发的关键。四川盆地下侏罗统陆相页岩气主要发育于湖湘泥页岩中。通过老井复查和重新评价,已在川东建南、元坝地区获得页岩气工业气流,展示了下侏罗统页岩气良好的潜力和可采性。对四川盆地下侏罗统页岩气形成条件和富集关键控制因素分析认为,下侏罗统湖相泥页岩分布广泛,具自生自储连续型气藏的特点。泥页岩有机质丰度、滞留烃的厚度和较好的保存条件是下侏罗统页岩气富集的主控因素;脆性矿物含量给大型水力压裂改造创造了较好条件;合理的试采方式是下侏罗统获得页岩气工业气流和长期稳产的关键;页岩气评价、压裂试验、测试证实,四川盆地下侏罗统页岩气是陆相页岩气突破和建产的有利目标。Abstract: Compared with the successful exploration of shale gas in the North America, the shale gas in the main hydrocarbon-bearing basins in our country is hosted in continental deposition. The mineral composition and sedimentary structure of shale are different between continental and marine facies. The characteristics of fracturing related to rock mechanics are the keys for the effective development of continental shale gas. The shale gas in continental facies mainly develops in mud-shale stones of lacustrine facies in the Lower Jurassic, the Sichuan Basin. Through a lot of old wells reviewed and reevaluated, we have acquired industrial shale gas in Jiannan and Yuanba areas in the east of Sichuan, showing a good potential. The controlling factors for the generation and accumulation of shale gas in the Lower Jurassic of the Sichuan Basin have been analyzed, indicating that the lacustrine facies mud-shale stones are widespread in the Lower Jurassic and are outstanding for in-situ creation and in-situ accumulation. The TOC of mud-shale stones, the thickness of entrapped hydrocarbon and favorable preservation conditions all control the accumulation of shale gas in the Lower Jurassic. The contents of brittle mineral provide good conditions for massive hydraulic fracturing. Reasonable extract mode is the key to acquire industrial and long-term productions. According to shale gas evaluation and fracturing test, the shale gas in the Lower Jurassic of the Sichuan Basin is a favorable target for the breakthrough and built-up of shale gas in continental facies.
-
Key words:
- recoverable /
- continental facies /
- shale gas /
- Lower Jurassic /
- Sichuan Basin
-
[1] 李大荣.美国页岩气资源及勘探历史[J].石油知识,2004,104(1):61. [2] 陈会年,张卫东,谢麟元,等.世界非常规天然气的储量及开采现状[J].断块油气田,2010,17(4):439-442. [3] 周庆凡.世界页岩气资源量最新评价[J].石油与天然气地质,2011,32(4):614. [4] 张大伟.加速我国页岩气资源调查和勘探开发战略构想[J].石油与天然气地质,2010,31(2):135-139. [5] Curtis J B.Fractured shale-gas systems[J].AAPG Bulletin,2002,86(11):1921-1938. [6] Caldwell R.Unconventional resources:are they for real?[J].Scotia Newsletter,2006,(March):1-2. [7] 范昌育,王震亮.页岩气富集与高产的地质因素和过程[J].石油实验地质,2010,32(5):465-469. [8] 李智锋,李治平,王杨,等.页岩气储层渗透性测试方法对比分析[J].断块油气田,2011,18(6):761-764 [9] Montgomery S L,Jarvie D M,Bowker K A,et al.Mississippian Barnett Shale,Fort Worth basin,north-central Texas:Gas-shale play with multi-trillion cubic foot potential[J].AAPG Bulletin,2005,89(2):155-175. [10] 聂海宽,张金川.页岩气储层类型和特征研究:以四川盆地及其周缘下古生界为例[J].石油实验地质,2011,33(3):219-225. [11] 聂海宽,何发岐,包书景.中国页岩气地质特殊性及其勘探对策[J].新能源,2011,31(11):1-6. [12] 董大忠,程克明,王玉满,等.中国上扬子区下古生界页岩气形成条件及特征[J].石油与天然气地质,2010,31(3):288-299. [13] 陈祥,王敏,严永新,等.泌阳凹陷陆相页岩油气成藏条件[J].石油与天然气地质,2011,32(4):568-576. [14] 陈祥,严永新,章新文,等.南襄盆地泌阳凹陷陆相页岩气形成条件研究[J].石油实验地质,2011,33(2):137-141. [15] 李军, 陶士振,汪泽成,等.川东北地区侏罗系油气地质特征与成藏主控因素[J].天然气地球科学,2010,21(5):732-741. [16] 邓康龄.四川盆地柏垭—石龙场地区自流井组大安寨段油气成藏地质条件[J].油气地质与采收率,2001,8(2):9-13. [17] 梁狄刚,冉隆辉,戴弹申,等.四川盆地中北部侏罗系大面积非常规石油勘探潜力的再认识[J].石油学报,2011,32(1):8-17. [18] 张林晔,李政,朱日房.页岩气的形成与开发[J].天然气工业,2009,29(1):124-128. -
计量
- 文章访问数: 4411
- HTML全文浏览量: 73
- PDF下载量: 2550
- 被引次数: 0