东营凹陷沙三—沙四段砂岩储层超压成因与演化

doi:10.11743/ogg20130204

摘要/Abstract

摘要：

渤海湾盆地东营凹陷沙三—沙四段砂岩储层发育中-强幅度超压,钻井实测压力换算的最大压力系数为2.0,最大剩余压力达40 MPa。分析发现,储层含油性与超压发育程度具有相关性,认为现今储层超压主要源自烃源岩生油超压流体传递。综合盆地模拟技术和流体包裹体分析,恢复了沙三—沙四段砂岩储层古压力的演化历史,认为沙三段—东营组沉积末期的快速沉降作用是导致孔隙流体排出受阻而形成第一期储层流体超压的主要原因,但东营组沉积末期—馆陶组沉积初期构造抬升的泄压作用可使孔隙流体压力降低至常压;在明化镇组沉积末期—现今,由于烃源岩主体仍然处于主油阶段,烃源岩生烃作用产生的大量含油气超压流体充注砂岩储层是形成第二期储层超压的主导成因。

关键词: 盆地模拟, 流体包裹体, 超压成因, 储层超压, 沙三—沙四段, 东营凹陷

Abstract:

The sandstone reservoirs within the 3^rd and 4^th members of Shahejie Formation in Dongying Depression, the Bohai Bay Basin are moderately to strongly overpressured with the maximum pressure coefficient of 2.0 and the maximum excessive pressure of 40 MPa calculated based on the measured pressures.Analysis indicates that oil-bearing properties of the reservoirs correlate to the development degree of overpressure,and current reservoir overpressure is mainly caused by the overpressured fluids from source rocks.Integrated with basin modeling and fluid inclusions analysis,this paper reconstructed the geo-pressure evolutionary history of the sandstone reservoirs in the 3^rd and 4^th member of Shahejie Formation.The first stage reservoir overpressure was mainly caused by the rapid subsidence during the deposition of the 3^rd member of Shahejie Formation to the end of Dongying Formation that blocked pore fluid discharging.The overpressure might be released to hydrostatic pressure along with the tectonic uplifting during the late Dongying Formation to early Guantao Formation.From the late Minghuazhen Formation to the present,the bulk of the source rock is still at peak oil generation and large amount of oil/gas-bearing overpressured fluid generated by the source rocks charge into the sandstone reservoirs,leading to the second stage overpressure.

Key words: basin modeling, fluid inclusion, overpressure genesis, reservoir overpressure, 3^rd and 4^th member of Shahejie Formation, Dongying Depression

中图分类号:

E122.1

郝雪峰. 东营凹陷沙三—沙四段砂岩储层超压成因与演化[J]. 石油与天然气地质, 2013, 34(2): 167-173. doi: 10.11743/ogg20130204 Hao Xuefeng. Overpressure genesis and evolution of sandstone reservoirs in the 3^rd and 4^th members of Shahejie Formation,the Dongying Depression[J]. Oil & Gas Geology, 2013, 34(2): 167-173. doi: 10.11743/ogg20130204

参考文献

[1] Hunt J M.Generation and migration of petroleum from abnormally pressured fluid compartments[J].AAPG Bulletin,1990,74(1):1-12.
[2] Yardley G S,Swarbrick R E.Lateral transfer:a source of additional overpressure?[J].Marine and Petroleum Geology,2000,17:523-537.
[3] Magara K.Compaction and fluid migration:practical petroleum geology[M].New York:Elsevier Scientific Publishing Company,1978.
[4] Osborne M J,Swarbrick R E.Mechanisms for overpressure in sedimentary basin:a reevaluation[J].AAPG Bulletin,1997,81(6):1023-1041.
[5] Daines S R.Aquathermal pressuring and geopressure evaluation[J].AAPG Bulletin,1982,66(7):931-939.
[6] Barker C.Calculated volume and pressure changes during the thermal cracking of oil to gas in reservoirs [J].AAPG Bulletin,1990,74(8):1254-1261.
[7] Bradley J S.Abnormal formation pressure[J].AAPG Bulletin,1975,59(6):957-973.
[8] 解习农,李思田,刘晓峰.异常压力盆地流体动力学[M].武汉:中国地质大学出版社,2006. Xie Xinong,Li Sitian,Liu Xiaofeng.Basin fluid dynamics in abnormally pressured environments[M].Wuhan:China University of Geosciences Press,2006.
[9] 操应长,徐涛玉,王艳忠,等.东营凹陷古近系储层超压成因及其成藏意义[J].西南石油大学学报(自然科学版),2009,31(3):34-38. Cao Yingchang,Xu Taoyu,Wang Yanzhong,et al.The origin of reservoir overpressure and its implication in hydrocarbon accumulation in the Paleocene of Dongying Depression[J].Journal of Southwest Petroleum University(Science & Technology Edition),2009,31(3):34-38.
[10] 郭小文,何生,宋国奇,等.东营凹陷生油增压成因证据[J].地球科学——中国地质大学学报,2011,36(6):1085-1094. Guo Xiaowen,He Sheng,Song Guoqi,et al.Evidences of overpressure caused by oil generation in Dongying Depression[J].Earth Science—Journal of China University Geosciences,2011,36(6):1085-1094.
[11] 何生,宋国奇,王永诗,等.东营凹陷现今大规模超压系统整体分布特征及主控因素[J].地球科学——中国地质大学学报,2012,37(5):1029-1042. He Sheng,Song Guoqi,Wang Yongshi,et al.Distribution and major control factors of the present-day large—scale overpressured system in Dongying Depression[J].Earth Science-Journal of China University Geosciences,2012,37(5):1029-1042.
[12] 张林晔,刘庆,张春荣,等.东营凹陷成烃与成藏关系研究[M].北京:地质出版社,2005. Zhang Hualin,Liu Qing,Zhang Chunrong,et al.Study on the genetic relationships between hydrocarbon occurrence and pools formation in Dongying Depression[M].Beijing:Geological Publishing House,2005.
[13] 蔡希源.湖相烃源岩生排烃机制及生排烃效率差异性——以渤海湾盆地东营凹陷为例[J].石油与天然气地质,2012,33(3):329-334 Cai Xiyuan.Hydrocarbon generation-expulsion mechanisms and efficiencies of lacustrine source rocks:a case study from the Dongying sag,Bohai Bay Basin[J].Oil & Gas Geology,2012,33(3):329-334.
[14] 朱筱敏,钟大康,张琴,等.济阳拗陷古近系碎屑岩储层特征和评价[M].北京:科学出版社,2008. Zhu Xiaomin,Zhong Dakang,Zhang Qin,et al.Paleogene clastic re-servoir characteristics and the evaluation of Jiyang Depression[M].Beijing:Scientific Press,2008.
[15] 远光辉,操应长,王艳忠.东营凹陷民丰地区沙河街组四段—三段中亚段沉积相与沉积演化特征[J].石油与天然气地质,2012,33(2):277-286. Yuan Guanghui,Cao Yingchang,Wang Yanzhong.Sedimentary facies and their evolution of the 4^th-middle 3^rd members of Shahejie Formation in Minfeng area,Dongying Sag[J].Oil & Gas Geology,2012,33(2):277-286.
[16] 孙海宁,万念明,徐涛玉.渤海湾盆地东营凹陷广利地区沙四上亚段物源体系及其对沉积的控制作用[J].石油与天然气地质,2010,31(5):583-593. Sun Haining,Wan Nianming,Xu Taoyu.Provenance systems and their control on the sedimentation of the upper Es⁴ in Guangli area of the Dongying Sag,the Bohai Bay Basin[J].Oil & Gas Geology,2010,31(5):583-593.
[17] 林畅松,郑和荣,任建业,等.渤海湾盆地东营、沾化凹陷早第三纪同沉积断裂作用对沉积充填的控制 [J].中国科学:地球科学,2003,33(11):1025-1036. Lin Changsong,Zheng Herong,Ren Jianye,et al.The sedimentary filling controlled by the early Tertiary syn-depositional faulting in Dongying and Zhanhua Depressions of Bohai Bay Basin[J].Science in China (Series D),2003,33(11):1025-1036.
[18] 郭小文,何生,郑伦举,等.生油增压定量模型及影响因素[J].石油学报,2011,32(4):637-644. Guo Xiaowen,He Sheng,Zheng Lunju,et al.A quantitative model for the overpressure caused by oil generation and its influential factors[J].Acta Petrolei Sinica,2011,32(4):637-644.
[19] Falvey D A,Middleton M F.Passive continental margins:evidence for a prebreakup deep crustal metamorphic subsidence mechanism[J].Oceanologic Acta,1981,4(S l):103-114.
[20] Mckenzie D.Some remarks on the development of sedimentary basins[J].Earth and Planetary Science Letters,1978,40(1):25-32.
[21] Ungerer P J,Burrus B S,Doligez P Y,et al.Basin evaluation by integra-ted two-dimensional modeling of heat transfer,fluid flow,hydrocarbon generation,and migration[J].AAPG Bulletin,1990,74(3):309-335.
[22] Sweeney J J,Burnham A K.Evaluation of a simple model of vitrinite reflectance based on chemical kinetics[J].AAPG Bulletin,1990,74(10):1559-1570.
[23] 张善文,张林晔,张守春,等.东营凹陷古近系异常高压的形成与岩性油藏的含油性研究[J].科学通报,2009,54(11):1570-1578. Zhang Shanwen,Zhang Linye,Zhang Shouchun,et al.Formation of abnormal high pressure and its application in the study of oil-bearing property of lithologic hydrocarbon reservoirs in the Dongying Sag[J].Chinese Science Bulletin,2009,54(11):1570-1578.
[24] 张海峰,姚益民,何青芳,等.利用米氏旋回法计算东营凹陷胜坨地区古近—新近系不整合的剥蚀量 [J].中国海上油气,2008,20(4):228-235. Zhang Haifeng,Yao Yimin,He Qingfang,et al.A calculation of denudation amount on Palaeogene-Neogene unconformity in Shengtuo area of Dongying Sag using Milankovitch cycle method[J].China Offshore Oil and Gas,2008,20(4):228-235.
[25] 吴智平,韩文功.济阳坳陷早晚第三纪沉积间断地层剥蚀量研究[J].中国海上油气,2000,14(5):320-323. Wu Zhiping,Han Wengong.Erosiveness under the hiatus between Paleocene and Neocene in Jiyang Depression[J].China Offshore Oil and Gas,2000,14(5):320-323.