四川盆地震旦系—下古生界高过成熟烃源岩演化史分析
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摘要
四川盆地震旦系—下古生界烃源岩处于高过成熟度阶段,其RO一般为2.36%~3.39%。根据埋藏史及古地温梯度,应用改进了的Karweil方法,将该烃源岩划分成4个演化阶段,并依据高科1井、盘1井和五科1井等重点井进行系统成熟度模拟,使之与实测的成熟度值一致,结果表明四川盆地西南部坳陷震旦系—下古生界烃源岩生烃最早,东部地区次之,乐山—龙女寺古隆起最晚,具体情况是:高科1井下寒武统烃源岩主生油期在中侏罗世,主生气期在晚侏罗世—早白垩世,盘1井下寒武统烃源岩主生油期在二叠纪,主生气期在晚三叠世;五科1井下寒武统烃源岩主生油期在早三叠世,主生气期在早中侏罗世;盘1井志留系烃源岩主生油期在晚三叠世,主生气期在中侏罗世,五科1井志留系烃源岩主生油期在早侏罗世,主生气期在晚侏罗世。
The Sinian-Lower Palaeozoic source rock in Sichuan basin is fallen into the high/over mature stage,with Ro of 2.36%~3.39%.Based on the improving Karweil,burial history and paleogeothermal gradient,the thermal history of source rock can be divided into four phases.The maturity simulation of source rocks from the wells of GK1,Pan1 and WK1,etc,is done and similar to the measured maturities.The time of oil & gas generation from the Sinian-Lower is the earlier in the southwest depression,then the eastern area,and later in the Leshan-Longnvsi paleouplift.The lower Cambrian source rock of GK1 well has the main oil peak in the middele Jurassic and gas peak in J3-K1;The peak period of oil generation in the Pan1 well is Permian,the gas peak period is T;The oil peak period of WK1 well is T1,the gas peak period is J1-J2.With regard to Silurian source rock,the peak period of oil in the Pan1 well is T3,the gas peak period is J2;the oil period of WK1 well is J1,the gas period is J3.
The Sinian-Lower Palaeozoic source rock in Sichuan basin is fallen into the high/over mature stage,with Ro of 2.36%~3.39%.Based on the improving Karweil,burial history and paleogeothermal gradient,the thermal history of source rock can be divided into four phases.The maturity simulation of source rocks from the wells of GK1,Pan1 and WK1,etc,is done and similar to the measured maturities.The time of oil & gas generation from the Sinian-Lower is the earlier in the southwest depression,then the eastern area,and later in the Leshan-Longnvsi paleouplift.The lower Cambrian source rock of GK1 well has the main oil peak in the middele Jurassic and gas peak in J3-K1;The peak period of oil generation in the Pan1 well is Permian,the gas peak period is T;The oil peak period of WK1 well is T1,the gas peak period is J1-J2.With regard to Silurian source rock,the peak period of oil in the Pan1 well is T3,the gas peak period is J2;the oil period of WK1 well is J1,the gas period is J3.
引文
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[2]王飞宇,何萍,程顶胜,等.下古生界高—过成熟烃源岩有机成熟度评价[J].天然气地球科学,1994,5(6):1-14.
[3]Xiao X M,Liu Z F,Liu D H,et al.A new method to recon-struct hydrocarbon-generating histories of source rocks in apetroleum-bearing basin-the method of geological andgeochemical sections[J].Chinese Science Balletin,2000,45(supp):97-104.
[4]肖贤明,刘德汉,傅家漠.沥青反射率作为烃源岩成熟度指标的意义[J].沉积学报,1991,9(增刊):138-146.
[5]金奎励.有机岩石学研究——以塔里木为例[M].北京:地震出版社,1997:155-181.
[6]钟宁宁,秦勇.碳酸盐岩有机岩石学[M].北京:科学出版社,1995:156-168。
[7]刘德汉,史继扬.碳酸盐岩高演化有机质的地球化学特征及油气非常规评价方法[J].天然气工业,1994,14(增刊):6-67.
[8]肖贤明,刘德汉,傅家谟.应用沥青反射率推算油气生成与运移的地质时间[J].科学通报,2000,45(19):2123-2127.
[9]刘若冰,田景春,魏志宏,等.川东南地区震旦系—志留系下组合有效烃源岩综合研究[J].天然气地球科学,2006,17(6):824-828.
[10]张林,魏国齐,吴世祥,等.四川盆地震旦系-下古生界沥青产烃潜力及分布特征[J].石油实验地质,2005,27(3):276-280.
[11]王兴志,陈科贵,黄继祥,等.四川盆地震旦系储集层次生储集空间内化学充填物研究[J].石油勘探与开发,2001,28(4):41-43.
[12]李国辉,李翔.四川盆地加里东古隆起震旦系气藏控制因素[J].石油与天然气地质,2000,21(1):80-83.
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