SOURCE ROCK THERMAL AND MATURITY HISTORY MODELING IN THE BAIYUN SAG OF THE PEARL RIVER MOUTH BASIN
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摘要: 珠江口盆地白云凹陷文昌组和恩平组陆相烃源岩热史及成熟史研究对白云凹陷深水油气勘探具有指导意义。在恢复白云凹陷地史和热史的基础上,利用EASY%Ro模型计算了白云凹陷西凹、主凹和东凹文昌组和恩平组两套烃源岩的成熟度史,并分别对比文昌组和恩平组烃源岩在白云凹陷西凹、主凹和东凹成熟度演化特征。研究结果表明:1)自始新世早期起白云凹陷热流值持续上升,在距今约44Ma时达到最大值大约为77mW/m2,现今热流值为60mW/m2左右。2)白云凹陷西凹、主凹和东凹文昌组烃源岩开始生烃(Ro=0.5%)时间分别为距今43,44,35Ma,达到生烃高峰(Ro=1.0%)时间分别为距今30,35,17Ma,达到高成熟(Ro=1.3%)时间分别为距今25,33,13Ma;而恩平组烃源岩开始生烃时间分别为距今20,30,22Ma,达到生烃高峰时间分别为距今10,22,8Ma,达到高成熟时间分别为距今8,17,0Ma。3)白云凹陷主凹烃源岩生烃时间最早,主生油期时间短,热演化程度最高;东凹烃源岩生烃时间最晚,主生油期时间长,热演化程度最低。Abstract: It is significant to study the source rock maturity history of the Baiyun Sag for the deep water exploration in the Baiyun Sag of the Pearl River Mouth Basin.Based on geohistory and thermal history of the Baiyun Sag,using EASY% Ro model reconstruction of the source rock maturity history in the western sag,the middle sag and the eastern sag of the Baiyun Sag.Comparing to the character of the Wenchang and Enping Formation source rocks maturity evolution in the western sag,the middle sag and the eastern sag.The studies indicate: 1)The studies of the Well B1 indicate that the character of the heat flow evolution is divided into two phase which is continuate rise in the forepart and gradually decline in the latter part in the Baiyun Sag.The heat flow reaches the maximum(76.7 mW/m2) at 44.4 Ma,the heat flow is about 60 mW/m2 at present.2)The Wenchang Formation source rock in the western sag,the middle sag and the eastern sag begins to generate hydrocarbon(Ro=0.5%)about at 43,44,35 Ma,reaches the hydrocarbon generation peak(Ro=1.0%) about at 30,35,17 Ma,reaches the high maturity(Ro=1.3%) about at 25,33,13 Ma.The Enping Formation source rock begins to generate hydrocarbon about at 20,30,22 Ma,reaches the hydrocarbon generation peak about at 10,22,8 Ma,reaches the high maturity about at 8,17,0 Ma.3)The thermal evolution of the Wenchang and Enping Formation source rocks in the middle sag of the Baiyun Sag is the highest,the time of the hydrocarbon generation is earliest and the main hydrocarbon generation phase is the shortest;the thermal evolution of the Wenchang and Enping Formation source rocks in the western sag is the lowest,the time of the hydrocarbon generation is latest and the main hydrocarbon generation phase is the longest.
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Key words:
- burial history /
- thermal history /
- maturity history /
- basin modelling /
- the Baiyun Sag /
- the Pearl River Mouth Basin
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[1] 张庆春,石广仁,田在艺.盆地模拟技术的发展现状与未来展望[J].石油实验地质,2001,23(3),312～317 [2] Welte D H.Petroleum origin and accumulation in basin evolution:A quantitative model[J].AAPG Bull,1981,65:1387～1396 [3] Nakayama K,VanSiclin D C.Simulation model for petroleum exploration[J].AAPG Bull,1981,65:1230～1255 [4] Beaumont C,Boutilier R,Mackenzie A S.Isomerization and aromatization of hydrocarbons and the paleothermometry and burial history of the Alberta Foreland Basin[J].AAPG Bull,1985,69:546～566 [5] 徐旭辉,江兴歌,朱建辉.断陷-拗陷原型迭加系统的生烃史:以苏北盆地溱潼凹陷为例[J].石油实验地质,2006,28(3):225～230 [6] Guidish T M.Basin evaluation using burial history calculation:An overview[J].AAPG Bull,1985,69:92～105 [7] Nakayama K.Hydrocarbon expulsion model and its application to Niigata Area,Japan[J].AAPG Bull,1987,71:810～821 [8] 李日容.油气成藏动力学模拟现状与展望[J].石油实验地质,2006,28(1):78～82 [9] Cao S,Lerche I.Geohistory,thermal history and hydrocarbon generation history of Navarin Basin Cost No.1well,Bering Sea,Alask[J].Petroleum Geology,1989,12(3):325～352 [10] 石广仁.油气盆地数值模拟方法[M].北京:石油工业出版社,1999.78～101 [11] 孙珍,庞雄,钟志洪等.珠江口盆地白云凹陷新生代构造演化动力学[J].地学前缘,2005,12 (4):489～498 [12] 胡圣标,汪集肠.沉积盆地热体制研究的基本原理和进展[J].地学前缘,1995,2(3):171～180 [13] 程本合,项希勇,穆星.济阳坳陷沾化凹陷东部热史模拟研究[J].石油实验地质,2002,22(2):172～175 [14] 陈长民,施和生,许仕策等.珠江口盆地(东部)第三系油气藏形成条件[M].北京:科技出版社,2003 [15] Mckenzie D P.Some remarks on the development of sedimentary basins[J].Earth and Planetary Science Letters,1978,40:25～32 [16] Sweeney J J,Burnham A K.Evaluation of a simple model of vitrinite reflectance based on chemical kinetics[J].AAPG Bull,1990,74:1559～1570 [17] Burnham A K,Sweeney J J.A chemical kinetic model of vitrinite maturation and reflectance[J].Geochimica et Cosmochimica Acta,1989,53(10):2649～2656 -
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