渤海湾盆地东濮凹陷压力演化与超压形成机制
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摘要
通过实测压力、泥岩声波时差、流体包裹体古压力恢复及盆地模拟,对东濮凹陷北部地区地层压力的演化和现今压力特征进行分析,结合岩心观察解析超压的形成机制,探讨不同机制对超压的贡献率。结果表明:剩余压力的演化经历"超压原始积累-超压释放-超压重新形成"3个阶段,两次超压的形成时期与油气成藏的时期相对应;古今超压的空间展布均受构造格局、断裂活动和膏盐岩分布的控制,洼陷带以及盐下、盐间地层的剩余压力较大;超压的形成主要为欠压实作用、生烃作用及膏盐岩作用的结果,生烃作用对超压的贡献率与烃源岩的热演化相关。
The pressure evolution and present pressure characteristics in north part of Dongpu depression were analyzed based on the measured pressure,mudstone sonic log interval,the pressure recovery by fluid inclusions and basin modeling.The overpressure formation mechanism was analyzed combined with core observation,and the contribution rate of hydrocarbon generation on the overpressure caused by different mechanisms was discussed.The conclusions are as follows.Firstly,that residual pressure evolution experienced three stages: primitive accumulation-release-reform,and two overpressure formation periods are corresponded with the oil and gas accumulation period.Secondly,the distribution of paleo-pressure and present pressure are controlled by tectonic framework,fault activity and plaster salt-gypsum rock distribution.Moreover,the formation in subsag belt or below/between the salt-gypsum rock developed larger residual pressure.Lastly,overpressure formation is mainly caused by compaction disequilibrium,hydrocarbon generation and salt-gypsum rock effect.In addition,the contribution rate of hydrocarbon generation on the overpressure is related to the thermal evolution of source rocks.
The pressure evolution and present pressure characteristics in north part of Dongpu depression were analyzed based on the measured pressure,mudstone sonic log interval,the pressure recovery by fluid inclusions and basin modeling.The overpressure formation mechanism was analyzed combined with core observation,and the contribution rate of hydrocarbon generation on the overpressure caused by different mechanisms was discussed.The conclusions are as follows.Firstly,that residual pressure evolution experienced three stages: primitive accumulation-release-reform,and two overpressure formation periods are corresponded with the oil and gas accumulation period.Secondly,the distribution of paleo-pressure and present pressure are controlled by tectonic framework,fault activity and plaster salt-gypsum rock distribution.Moreover,the formation in subsag belt or below/between the salt-gypsum rock developed larger residual pressure.Lastly,overpressure formation is mainly caused by compaction disequilibrium,hydrocarbon generation and salt-gypsum rock effect.In addition,the contribution rate of hydrocarbon generation on the overpressure is related to the thermal evolution of source rocks.
引文
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[17]奇林格G V,等.异常地层压力成因与预测[M].赵文智,等,译.北京:石油工业出版社,2004.
[18]唐小云,龚晶晶,杨世刚,等.东濮凹陷文留地区古近系超压成因分析[J].油气地质与采收率,2007,14(5):20-22.TANG Xiao-yun,GONG Jing-jing,YANG Shi-gang,et al.Eogene overpressure origin analysis in Wenliu area of Dongpu depression[J].Petroleum Geology and Recovery Efficiency,2007,14(5):20-22.
[2]张启明,董伟良.中国含油气盆地中的超压体系[J].石油学报,2000,21(6):1-11.ZHANG Qi-ming,DONG Wei-liang.Overpressure system of hydrocarbon-bearing basins in China[J].Acta Petrolei Sinica,2000,21(6):1-11.
[3]陈中红,查明.断陷湖盆超压分布特征及其与油气成藏的关系[J].石油学报,2008,29(4):509-515.CHEN Zhong-hong,ZHA Ming.Distribution characteris-tics of overpressure and its controlling to hydrocarbon ac-cumulation in terrigenous faulted basin[J].Acta Petrolei Sinica,2008,29(4):509-515.
[4]刘士林,郑和荣,林舸,等.渤海湾盆地东营凹陷异常压力分布和演化特征及与油气成藏关系[J].石油实验地质,2010,32(3):233-237.LIU Shi-lin,ZHENG He-rong,LIN Ge,et al.Distribu-tion and evolution characteristics of abnormal pressure and its relationship with hydrocarbon accumulation in the Dongying sag of Bohai Bay Basin.[J].Petroleum Geolo-gy&Experiment,2010,32(3):233-237.
[5]刘华,蒋有录,宋国奇,等.渤海湾盆地东营凹陷沙四下亚段地层压力演化与天然气成藏[J].沉积学报,2012,30(1):197-203.LIU Hua,JIANG You-lu,SONG Guo-qi,et al.Pressure evolution and gas accumulation of the fourth member of the Shahejie formation in Dongying depression,Bohai Bay Basin[J].Acta Sedimentologica Sinica,2012,30(1):197-203.
[6]周新科,许化政.东濮凹陷地质特征研究[J].石油学报,2007,28(5):20-26.ZHOU Xin-ke,XU Hua-zheng.Discussion on geological features of Dongpu depression[J].Acta Petrolei Sinica,2007,28(5):20-26.
[7]孙波,蒋有录,张善文,等.东濮凹陷北部膏盐岩分布特征及其对地层温度的影响[J].油气地质与采收率,2012,19(1):28-30.SUN Bo,JIANG You-lu,ZHANG Shan-wen,et al.Dis-tribution characteristics of salt and its influence to the geo-temperature in north part of Dongpu depression[J].Petroleum Geology and Recovery Efficiency,2012,19(1):28-30.
[8]罗权生,荆文波,聂朝强.台北凹陷第三系膏盐岩对油气运聚的意义[J].石油勘探与开发,2000,27(1):29-31.LUO Quan-sheng,JING Wen-bo,NIE Chao-qiang.Sig-nificance of the Tertiary plaster salt rock in Taibei depres-sion to migration and accumulation of hydrocarbon[J].Petroleum Exploration and Development,2000,27(1):29-31.
[9]万桂梅,汤良杰,金文正,等.盐岩在库车坳陷中的作用[J].西南石油大学学报:自然科学版,2008,30(1):14-17.WAN Gui-mei,TANG Liang-jie,JIN Wen-zheng,et al.Function of salt rock in Kuqa sag[J].Journal of South-west Petroleum University(Science&Technology Edi-tion),2008,30(1):14-17.
[10]刘德汉,卢焕章,肖贤明.油气包裹体及其在石油勘探和开发中的应用[M].广州:广东科技出版社,2005.
[11]米敬奎,肖贤明,刘德汉,等.利用储层流体包裹体的PVT特征模拟计算天然气藏形成的古压力:以鄂尔多斯盆地上古生界深盆气藏为例[J].中国科学:D辑,2003,33(7):679-685.MI Jing-kui,XIAO Xian-ming,LIU De-han,et al.The ancient pressure of gas accumulation simulated by the PVT characteristic of reservoir fluid inclusions:taking deep basin gas of the upper Proterozoic in Ordos Basin for example[J].Science in China(ser D),2003,33(7):679-685.
[12]李静,查明.基于流体包裹体的任丘油田迷雾山组成藏期次确定与古压力恢复[J].中国石油大学学报:自然科学版,2010,34(4):38-43.LI Jing,ZHA Ming.Determination of oil accumulation period and building up of paleopressure of Wumishan formation in Renqiu Oilfield by using fluid inclusion[J].Journal of China University of Petroleum(Edition of Natural Science),2010,34(4):38-43.
[13]李善鹏,邱楠生.利用盆地模拟方法分析昌潍坳陷古压力[J].新疆石油学院学报,2003,15(4):5-8.LI Shan-peng,QIU Nan-sheng.Analyzing the paleopre-ssure of Changwei depression by the use of basin model-ing method[J].Journal of Xinjiang Petroleum Institute,2003,15(4):5-8.
[14]曹强,叶加仁,郭飞飞,等.伊通盆地莫里青断陷地层压力演化与油气运聚[J].吉林大学学报:地球科学版,2009,39(4):642-649.CAO Qiang,YE Jia-ren,GUO Fei-fei,et al.Pressure evolution in the Moliqing fault-depression,Yitong Basin[J].Journal of Jilin University:Earth Science Edition,2009,39(4):642-649.
[15]邹海峰.大港探区前第三系古流体和古温压特征及演化[D].长春:吉林大学地球科学学院,2000.ZOU Hai-feng.The characteristics and evolution of pa-leo-fliud and paleo-temperature-pressure of Pre-Tertiary in Dagang exploration area[D].Changchun:College of Earth Sciences,Jilin University,2000.
[16]刘福宁.异常高压区的古沉积厚度和古地层压力恢复方法探讨[J].石油与天然气地质,1994,15(2):180-185.LIU Fu-ning.An approach to reconstruction of paleo-sedimentary thickness and paleo-formation pressure in abnormal high pressure region[J].Oil&Gas Geology,1994,15(2):180-185.
[17]奇林格G V,等.异常地层压力成因与预测[M].赵文智,等,译.北京:石油工业出版社,2004.
[18]唐小云,龚晶晶,杨世刚,等.东濮凹陷文留地区古近系超压成因分析[J].油气地质与采收率,2007,14(5):20-22.TANG Xiao-yun,GONG Jing-jing,YANG Shi-gang,et al.Eogene overpressure origin analysis in Wenliu area of Dongpu depression[J].Petroleum Geology and Recovery Efficiency,2007,14(5):20-22.