天峨-南丹地区泥盆系罗富组页岩气成藏条件及有利区预测
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摘要
通过野外地质调查、钻测井资料分析、有机地化分析及现场含气量解析等工作手段,对桂西北天峨–南丹地区中泥盆统罗富组页岩气的烃源岩特征、储集条件、富集规律及保存条件进行了深入分析。结果表明:研究区罗富组沉积期为半深‐深水台盆相沉积环境,具有明显的垂直分带性,罗富组上段岩性为硅质泥岩、泥页岩,暗色泥页岩有效厚度40~80 m,下段以灰岩、泥灰岩为主;罗富组泥页岩TOC平均值为2.36%;有机质类型属典型的混合型干酪根,上段为Ⅱ_1腐殖腐泥型,下段为Ⅱ_2腐泥腐殖型;烃源岩整体成熟度较高,R_o大于2.0%;泥页岩石英平均含量为30.5%,碳酸盐矿物平均含量为24.6,黏土矿物含量42.2%,储集空间以泥页岩粒间孔、溶蚀孔和有机质孔为主;区域具备良好的页岩气形成与富集条件。推断保存条件是天峨–南丹区页岩气富集的关键,预测更亮‐困里一带为页岩气有利勘探区带。
Based on field geological survey analysis, drilling data analysis, organic geochemical analysis and field gas content analysis, the study on accumulation conditions, reservoir conditions, enrichment regularity and preserving conditions of shale gas in Luofu formation of Devonian in Tian'e-Nandan area of northwestern Guangxi was carried out. The results indicated the depositional period of Luofu formation in this area was semi-deep-water interplatform basin of depositional environment and it had obvious vertical zoning. The upper lithology of Luofu formation was siliceous mudstone, shale and dark shale were 40~80 m, mainly of limestone construction. The overall maturity of Luofu formation was high, the average maturity(Ro) was greater than 2.0%, and the average TOC was 2.36%. The organic type was a typical mixed kerogen, the upper part of Ⅱ1 was humic saprophy and the lower section of Ⅱ2 was sap humus. The average content of shale quartz was 30.5% and the carbonate mineral content was 24.6%. The clay mineral content was 42.2% and the reservoir space was mainly composed of interglacial pores, dissolution holes and organic matter holes. Therefore, the region was qualified with good shale gas accumulation and enrichment conditions. It was concluded the preserving condition was the key to the shale gas enrichment in the Tian'e-Nandan region, and the Gengliang-Kunli region was predicted to be favorable exploration area.
Based on field geological survey analysis, drilling data analysis, organic geochemical analysis and field gas content analysis, the study on accumulation conditions, reservoir conditions, enrichment regularity and preserving conditions of shale gas in Luofu formation of Devonian in Tian'e-Nandan area of northwestern Guangxi was carried out. The results indicated the depositional period of Luofu formation in this area was semi-deep-water interplatform basin of depositional environment and it had obvious vertical zoning. The upper lithology of Luofu formation was siliceous mudstone, shale and dark shale were 40~80 m, mainly of limestone construction. The overall maturity of Luofu formation was high, the average maturity(Ro) was greater than 2.0%, and the average TOC was 2.36%. The organic type was a typical mixed kerogen, the upper part of Ⅱ1 was humic saprophy and the lower section of Ⅱ2 was sap humus. The average content of shale quartz was 30.5% and the carbonate mineral content was 24.6%. The clay mineral content was 42.2% and the reservoir space was mainly composed of interglacial pores, dissolution holes and organic matter holes. Therefore, the region was qualified with good shale gas accumulation and enrichment conditions. It was concluded the preserving condition was the key to the shale gas enrichment in the Tian'e-Nandan region, and the Gengliang-Kunli region was predicted to be favorable exploration area.
引文
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[2]白忠峰.桂中坳陷构造特征及其与油气关系[D].北京:中国地质大学(北京),2006.
[3]曾芳,毛治超,卢碧林.桂中坳陷泥盆系碳酸盐岩烃源岩特征[J].油气地质与采收率,2010,17(3):51–53.
[4]徐胜林,尚云志,陈安清.黔南–桂中地区泥盆系沉积体系研究[J].四川地质学报,2007,27(1):7–12.
[5]王鹏万,姚根顺,陈子炓,等.桂中坳陷泥盆纪生物礁储层特征及演化史[J].中国地质,2011,38(1):170–179.
[6]吴国干,姚根顺,徐政语,等.桂中坳陷改造期构造样式及其成因[J].海相油气地质,2009,14(1):33–40.
[7]陈丛林,史晓颖.右江盆地晚古生代深水相地层沉积构造演化[J].中国地质,2006,33(2):436–443.
[8]林良彪,陈洪德,陈子炓,等.桂中坳陷中泥盆统烃源岩特征[J].天然气工业,2009,29(3):45–47.
[9]姚根顺,贺晓苏.桂中坳陷泥盆系烃源岩发育环境及潜力评价[J].中国地质,2011,32(2):273–279.
[10]王鹏万,陈子炓.桂中坳陷泥盆系页岩气成藏条件与有利区带评价[J].石油与天然气地质,2012,33(3):33–34.
[11]广西区调四分队.1∶5万六寨–黄江幅区域地质测量报告[R].1988:23–25.
[12]庞飞,包书景.修武盆地下寒武统页岩气富集条件及有利区预测[J].东北石油大学学报,2014,38(5):23–28.
[13]郭岭,姜在兴,姜文利.页岩气储层的形成条件与储层的地质研究内容[J].地质通报,2011,30(Z1):385–392.
[14]王社教,杨涛,张国生,等.页岩气主要富集因素与核心区选择及评价[J].中国工程科学,14(6):94–100.