EVALUATION OF THE EXCELLENT TRIASSIC TO SILURIAN MARINE HYDROCARBON SOURCE ROCKS IN XUANHAN-DAXIAN AREA OF NORTHEAST SICHUAN BASIN
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摘要: 普光5井、毛坝3井是川东北宣汉—达县地区重要的探井,为研究该区的油气成藏条件提供了宝贵的基础资料。对普光5井、毛坝3井等钻遇的海相地层的有机碳含量、氯仿沥青"A"、生烃潜量等进行分析,建立了该区的有机地化综合剖面。结合区域地质资料综合分析认为:宣汉—达县地区在三叠—志留系海相地层中发育了上二叠统龙潭组黑色泥岩及碳质泥岩、中下志留统黑色泥岩2套海相优质烃源岩。飞仙关组鲕粒滩和长兴组生物礁储层中固体沥青含量高、分布范围广、且为热演化成因,表明该储层中曾经存在着古油藏,是优质的再生烃(气)源。此外茅口组泥灰岩、栖霞组深灰色灰岩等有机碳含量也较高,综合评价为中等烃源岩。宣汉—达县地区多套优质烃源岩及再生烃源的存在,为该区的油气勘探提供了雄厚的物质基础。Abstract: Wells Puguang 5 and Maoba 3 were important in Xuanhan-Daxian exploration area in northeastern Sichuan basin,which supplied important evidence for the studies of the oil and gas accumulation conditions of this area.The organic geochemistry synthetic section was established by the data of TOC,chloroform bieuminous "A" and the hydrocarbon generation potential of the drilled marine sequences by wells Puguang 5 and Maoba 3.Synthetic analysis based on the organic geochemistry section,combining with regional geology information,indicated that there were two sets of excellent marine source rocks developed in the Triassic to Silurian strata of the area,i.e.the Upper Permian Longtan Formation black mudstones and carbargillite,and the Mid-Lower Silurian black mudstones.The solid bitumen occurred in Feixianguan oolite reservoir and Changxing biogenetic reef reservoir was characterized by thermal evolution origin,abundant contents and wide distribution,indicating that there were ancient oil pools in Feixianguan and Changxing reservoirs.The ancient oil pools were believed to be excellent secondary hydrocarbon generation source.Furthermore,the muddy limestone of Maokou Formation and the fuscous limestone of Qixia Formation were medium quality of source rocks.Existence of a lot of excellent hydrocarbon source rocks and secondary hydrocarbon generation source could supply abundant matters for the hydrocarbon accumulation in this area.
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[1] 马永生,蔡勋育.四川盆地川东北区二叠系-三叠系天然气勘探成果与前景展望[J].石油与天然气地质,2006,27(6):241～250 [2] 马永生,傅强,郭彤楼.川东北地区普光气田长兴-飞仙关气藏成藏模式与成藏过程[J].石油实验地质,2005,27(5):455～461 [3] 马永生.四川盆地普光超大型气田的形成机制[J].石油学报,2007,28(2):1～14 [4] 谢增业,田世澄,单秀琴.川东北飞仙关组鲕滩天然气富集成藏特征及勘探前景[J].石油勘探与开发,2005,32(2):30～34 [5] 蔡立国,饶丹,潘文蕾.川东北地区普光气田成藏模式研究[J].石油实验地质,2005,27(5):462～467 [6] 王兰生,李宗银,沈平.四川盆地东部大中型气藏成烃条件分析[J].天然气地球科学,2004,15(6):567～571 [7] 腾格尔,高长林,胡凯等.上扬子东南缘下组合优质烃源岩发育及生烃潜力[J].石油实验地质,2006,4(28):359～365 [8] 腾格尔,高长林,胡凯等.上扬子北缘下组合优质烃源岩分布及生烃潜力评价[J].天然气地球科学,2007,18(2):254～258 [9] 黄籍中.应用稳定碳同位素δ13C值进行识别干酪根类型的尝试[J].石油实验地质,1980,(2):49～54 [10] 傅家谟.干酪根地球化学[M].广州:广东科技出版社,1995.459～463 [11] 黄第藩,李晋超,张大江.干酪根类型及其分类参数的有效性、局限性和相关性[J].沉积学报,1984,2(3):29～31 [12] 秦建中,钱志浩,曹寅等.油气地球化学新技术新方法[J].石油实验地质,2005,27(5):519～527 [13] 曹寅,钱志浩.油气地质实验分析技术发展趋势与展望[J].石油实验地质,2003,25(增刊):621～624 [14] 秦建中,付小东,刘效曾.四川盆地东北部气田海相碳酸盐岩储层固体沥青研究[J].地质学报,2007,81(8):1065～1071 [15] 谢增业,田世澄,魏国齐等.川东北飞仙关组储层沥青与古油藏研究[J].天然气地球科学,2005,16(3):283～285 [16] 谢增业,李剑,单秀琴等.川东北罗家寨飞仙关组气藏成藏过程及聚集效率[J].石油与天然气地质,2005,26(6):283～287 [17] 谢增业,魏国齐,李剑等.川东北飞仙关组鲕滩储层沥青与天然气成藏过程[J].天然气工业,2004,24(12):17～19 [18] 秦建中.中国烃源岩[M].北京:科学出版社,2005.228～230 [19] 秦建中,刘宝泉,国建英等.关于碳酸盐烃源岩的评价标准[J].石油实验地质,2004,26(3):281～285 [20] 秦建中,李志明,刘宝泉等.海相优质烃源岩形成重质油与固体沥青的潜力分析[J].石油实验地质,2007,29(03):280～285 [21] 黄籍中.从有机质成熟度看四川盆地下古生界油气勘探[J].天然气工业,2007,27(8):6～8 [22] 黄籍中.四川盆地两类两套油系煤系烃源岩异同与大中型气田型成[J].天然气勘探与开发,1998,21(4):1～11 [23] 黄籍中.中上扬子区海相沉积烃源研究(之二)[J].天然气勘探与开发,2000,23(1):9～27 [24] 胡世忠.对龙潭组定义及其划分原则的商榷[J].中国区域地质,1989,(1):69～73 [25] 胡世忠.对龙潭组划分等问题的意见[J].江苏煤炭,1991,(4):53～54 [26] 黄大瑞,蔡忠贤,朱扬明等.川东北龙潭(吴家坪)组沉积相与烃源岩发育[J].海洋石油,2007,27(3):57～63 [27] Zhang Qu,Huang Haiping,Zheng Lunju.Secondary hydrocharbon generation potential from heavy oil,oil sand and solid bitumen during the artificial maturation[J].Organic geoche-mistry,2007,38:2024～2035 [28] 罗开平,丁道桂,吕剑虹.南方海相油气勘探中的烃源条件分析:以江汉平原区为例[J].石油实验地质,2008,30(2):133～137 -
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