东濮凹陷新生代构造-热历史研究
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摘要
东濮凹陷位于渤海湾盆地南缘,是中国典型的既富石油又富天然气的凹陷之一。文中通过镜质体反射率恢复了9个构造单元31口典型井的新生代热历史。研究结果表明:东濮凹陷各构造单元的新生代热历史总的趋势是一致的,并表现为"马鞍型"特征,分别在沙三段沉积时期和东营组沉积中晚期达到地温梯度高峰,其地温梯度分别为45~48℃/km和39~40℃/km,两期地温梯度高峰揭示了东濮凹陷经历了沙三段沉积时期和东营组沉积中晚期强烈的裂陷运动;新近纪开始,凹陷进入热沉降阶段,地温梯度逐渐下降至现今的31~34℃/km。此外,研究成果还揭示了东濮凹陷烃源岩热演化受东营组沉积时期的古地温场控制。文中的研究成果可以为东濮凹陷深层油气资源评价提供地热基础。
The Dongpu sag,located in the south of the Bohai Bay Basin,has abundant oil and gas reserves.In this paper,the Cenozoic thermal history was reconstructed using vitrinite reflectance data from 31 wells in 9structural units.The results show that the Cenozoic thermal history exhibits a general trend of the "saddle type".The geothermal gradient reached high peaks twice during the 3rd stage of the Shahejie Formation &the middle and late stages of the Dongying Formation depositional periods at 45-48 ℃/km and 39-40 ℃/km,respectively,revealing that the Dongpu sag experienced two strong tectonic rifts during the geothermal gradient high peak periods.The geothermal gradient began to decrease from the Neogene period,and the geothermal gradient is 31-34 ℃/km at the present day.In addition,the results show that the source rock thermal evolution was controlled by the paleo-geothermal fields of the depositional period of the Dongying Formation in the Dongpu sag.This work may provide a geothermal basis for the deep well oil and gas resource evaluation in the Dongpu sag.
The Dongpu sag,located in the south of the Bohai Bay Basin,has abundant oil and gas reserves.In this paper,the Cenozoic thermal history was reconstructed using vitrinite reflectance data from 31 wells in 9structural units.The results show that the Cenozoic thermal history exhibits a general trend of the "saddle type".The geothermal gradient reached high peaks twice during the 3rd stage of the Shahejie Formation &the middle and late stages of the Dongying Formation depositional periods at 45-48 ℃/km and 39-40 ℃/km,respectively,revealing that the Dongpu sag experienced two strong tectonic rifts during the geothermal gradient high peak periods.The geothermal gradient began to decrease from the Neogene period,and the geothermal gradient is 31-34 ℃/km at the present day.In addition,the results show that the source rock thermal evolution was controlled by the paleo-geothermal fields of the depositional period of the Dongying Formation in the Dongpu sag.This work may provide a geothermal basis for the deep well oil and gas resource evaluation in the Dongpu sag.
引文
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[20]ZUO Y H,QIU N S,HAO Q Q,et al.Present geothermal fields of the Dongpu sag in the Bohai Bay Basin[J].Acta Geologica Sinica(English Edition),2014,88(3):915-930.
[21]SCLATER J G,CHRISIE P.Continental stretching:an explanation of the post-Mid-Cretaceous subsidence of the central North Sea Basin[J].Journal of Geophysical Research,1980,85:3711-3739.
[22]SWEENEY J J,BURNHAM A K.Evaluation of a simple model of vitrinite reflectance based on chemical kinetics[J].AAPG Bulletin,1990,74:1559-1570.
[23]FALVEY D A,MIDDLETON M F.Passive continental margins:evidence for pre-break up deep crustal metamorphic subsidence mechanism[J].Oceanologica Acta,1981,4:103-114.
[24]陈洁,鹿坤,冯英,等.东濮凹陷不同环境烃源岩评价及生排烃特征研究[J].断块油气田,2012,19(1):35-38.
[2]HE L J,WANG J Y.Tectono-thermal modelling of sedimentary basins with episodic extension and inversion,a case history of the Jiyang Basin,North China[J].Basin Research,2004,16(4):587-599.
[3]QIU N S,CHANG J,ZUO Y H,et al.Thermal evolution and maturation of lower Paleozoic source rocks in the Tarim Basin,northwest China[J].AAPG Bulletin,2012,96(5):789-821.
[4]QIU N S,ZUO Y H,ZHOU F Y,et al.Geothermal regime of the Bohai offshore area,Bohai Bay Basin,North China[J].Energy Exploration&Exploitation,2010,28(12):327-350.
[5]QIU N S,XU W,ZUO Y H,et al.Meso-Cenozoic thermal regime in the Bohai Bay Basin,eastern North China Craton[J].International Geology Review,2015,57(3):271-289.
[6]ZUO Y H,QIU N S,ZHANG Y,et al.Geothermal regime and hydrocarbon kitchen evolution of the offshore Bohai Bay Basin,North China[J].AAPG Bulletin,2011,95:749-769.
[7]ZUO Y H,QIU N S,HAO Q Q,et al.Geothermal regime and source rock thermal evolution history in the Chagan Sag,Inner Mongolia[J].Marine and Petroleum Geology,2015,59:245-267.
[8]ZUO Y H,WANG C C,TANG S L,et al.Mesozoic and Cenozoic thermal history and source rock thermal evolution of the Baiyinchagan sag,Erlian Basin,Northern China[J].Journal of Petroleum Science and Engineering,2016,139:171-184.
[9]CARMINATI E,CAVAZZA D,SCROCCA R,et al.Thermal and tectonic evolution of the southern Alps(northern Italy)rifting:coupled organic matter maturity analysis and thermokinematic modeling[J].AAPG Bulletin,2010,94:369-397.
[10]HIMANSU S S,MATTHIAS J R,BARRY P K,et al.Thermal history of the Krishna-Godavari basin,India:constraints from apatite fission track thermochronology and organic maturity data[J].Journal of Asian Earth Sciences,2013,73(5):1-20.
[11]ZUO Y H,QIU N S,LI J W,et al.Meso-Cenozoic tectonothermal evolution history in Bohai Bay Basin,North China[J].Journal of Earth Science,2015,26(3):352-360.
[12]刘丽,任战利,崔营滨,等.东濮凹陷现今地温场分布特征[J].地质科学,2007,42(4):78-94.
[13]姚合法,任玉林,申本科.渤海湾盆地中原地区古地温梯度恢复研究[J].地学前缘,2006,13(3):135-140.
[14]苏惠,曲丽萍,张金川,等.裂陷盆地构造演化及盆地伸展模式:以东濮凹陷为例[J].石油与天然气地质,2006,27(1):70-71.
[15]侯贵廷,钱祥麟,蔡东升.渤海湾盆地中、新生代构造演化研究[J].北京大学学报(自然科学版),2001,37(6):845-850.
[16]HUANG C Y,ZHANG J C,WANG H,et al.Lacustrine shale deposition and variable tectonic accommodation in the rift basins of the Bohai Bay Basin in Eastern China[J].Journal of Earth Science,2015,26(5):700-711.
[17]邱楠生,胡圣标,何丽娟.沉积盆地热体制研究的理论和应用[M].北京:石油工业出版社,2004.
[18]MENZIES M,XU Y G,ZHANG H F,et al.Integration of geology,geophysics and geochemistry:a key to understanding the North China Craton[J].Lithos,2007,96(1/2):1-21.
[19]龚育龄.中国东部渤海湾盆地热结构和热演化[D].南京:南京大学.
[20]ZUO Y H,QIU N S,HAO Q Q,et al.Present geothermal fields of the Dongpu sag in the Bohai Bay Basin[J].Acta Geologica Sinica(English Edition),2014,88(3):915-930.
[21]SCLATER J G,CHRISIE P.Continental stretching:an explanation of the post-Mid-Cretaceous subsidence of the central North Sea Basin[J].Journal of Geophysical Research,1980,85:3711-3739.
[22]SWEENEY J J,BURNHAM A K.Evaluation of a simple model of vitrinite reflectance based on chemical kinetics[J].AAPG Bulletin,1990,74:1559-1570.
[23]FALVEY D A,MIDDLETON M F.Passive continental margins:evidence for pre-break up deep crustal metamorphic subsidence mechanism[J].Oceanologica Acta,1981,4:103-114.
[24]陈洁,鹿坤,冯英,等.东濮凹陷不同环境烃源岩评价及生排烃特征研究[J].断块油气田,2012,19(1):35-38.