渤海石臼坨凸起沙河街组深埋藏混积岩成岩作用特征
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摘要
渤海石臼坨凸起沙河街组发育一套湖相混积岩岩性段,呈现出良好的油气显示。利用显微岩石与矿物学观察、扫描电镜、电子探针、碳氧同位素地球化学、气液包裹体温度分析等方法技术,研究总结了渤海石臼坨凸起古近系沙河街组混积岩的成岩作用和孔隙演化特征。沙河街组混积岩储层主要为陆源碎屑质-碳酸盐混积岩,储集空间主要为残余原生粒间孔和生物体腔孔,为高孔高渗储层。储层中发育的成岩作用主要有:①压实作用;②胶结作用,主要为颗粒包壳、孔隙衬垫与充填和交代白云石等自生白云石胶结作用,自生白云石具有典型的多期生长特征;③溶蚀作用,主要为陆源碎屑中的长石、岩屑等的溶蚀,其次是早期衬垫白云石的溶蚀。伴随成岩演化,储层孔隙度由初始的40%演变到现今的22%。早期孔隙衬垫白云石、长石溶蚀对古近系沙河街组混积岩中的有利储层发育具有重要控制作用。
A set of lacustrine mixed siliciclastic-carbonate sediments was developed in the Shahejie Formation of Shijiutuo uplift, Bohai Sea, showing a good hydrocarbon display. This paper summarizes the diagenesis and pore evolution characteristics of the mixed siliciclastic-carbonate sediments in the Shahejie Formation of the Paleogene based on the polarized light microscopy observation, scanning electron microscopy, electron probe, carbon and oxygen isotope geochemistry, and gas-liquid inclusions temperature analysis. The rock types of the Shahejie Formation reservoir are mainly mixed siliciclastic-carbonate sediments.The hydrocarbon pore volume is mainly the residual primary intergranular pores and the intrafossil pores, which is the high porous and high permeability reservoir.The main diagenesis in the study area is compaction, granulated coating, pores lining, filling and metasomatic dolomites and other authigenic carbonate minerals, authigenetic dolomite, showing a multi-period characteristics.The dissolution is mainly the dissolution of feldspars, lithic fragment, followed by the early liner dolomite dissolution. Along with diagenetic evolution, reservoir porosity evolved from the initial 40% to 22% of the present. Early pores lining dolomite and feldspar dissolution play an important role in controlling the favorable reservoir development in the mixed siliciclastic-carbonate sediments of the Shahejie Formation in the Paleogene.
A set of lacustrine mixed siliciclastic-carbonate sediments was developed in the Shahejie Formation of Shijiutuo uplift, Bohai Sea, showing a good hydrocarbon display. This paper summarizes the diagenesis and pore evolution characteristics of the mixed siliciclastic-carbonate sediments in the Shahejie Formation of the Paleogene based on the polarized light microscopy observation, scanning electron microscopy, electron probe, carbon and oxygen isotope geochemistry, and gas-liquid inclusions temperature analysis. The rock types of the Shahejie Formation reservoir are mainly mixed siliciclastic-carbonate sediments.The hydrocarbon pore volume is mainly the residual primary intergranular pores and the intrafossil pores, which is the high porous and high permeability reservoir.The main diagenesis in the study area is compaction, granulated coating, pores lining, filling and metasomatic dolomites and other authigenic carbonate minerals, authigenetic dolomite, showing a multi-period characteristics.The dissolution is mainly the dissolution of feldspars, lithic fragment, followed by the early liner dolomite dissolution. Along with diagenetic evolution, reservoir porosity evolved from the initial 40% to 22% of the present. Early pores lining dolomite and feldspar dissolution play an important role in controlling the favorable reservoir development in the mixed siliciclastic-carbonate sediments of the Shahejie Formation in the Paleogene.
引文
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[19] 王杰琼,刘波,罗平,等.塔里木盆地西北缘震旦系混积岩类型及成因[J].成都理工大学学报:自然科学版,2014,41(3):339-346.
[20] 官大勇,魏刚,王粤川,等.渤海海域渤中地区中深层储层控制因素分析:以石臼坨凸起东段陡坡带沙河街组为例[J].天然气勘探与开发,2012,35(2):5-7.
[21] 吴小红,韦阿娟,王应斌,等.渤海海域QHD32-6亿吨级大油田的形成条件分析[J].地质科技情报,2015,34(1):112-117.
[22] 刘志刚,周心怀,李建平,等.渤海海域石臼坨凸起东段36-3构造古近系沙二段储集层特征及控制因素[J].石油与天然气地质,2011,32(6):832-838.
[23] 李倩文,金振奎,姜福杰,等.白云岩成因碳氧同位素分析方法初探:以北京燕山地区元古界白云岩为例[J].岩性油气藏,2014,26(4):117-122.
[24] 盛军,孙卫,解腾云,等.苏里格气田东南部盒8段储层成岩作用研究及其孔隙演化模式定量分析[J].地质科技情报,2015,34(1):20-27.
[25] 黎盼,孙卫,高永利,等.致密砂岩储层差异性成岩演化对孔隙度定量演化表征影响:以鄂尔多斯盆地马岭地区长81储层为例[J].地质科技情报,2018,37(1):135-142.
[26] Wilson J C,Mcbride E F.Compaction and porosity evolution of Pliocene sandstones,Ventura basin,California[J].AAPG Bulletin American Association of Petroleum Geologists,1988,72(6):664-681.
[2] Palermo D,Aigner T,Geluk M,et al.Reservoir potential of a lacustrine mixed carbonate/siliciclastic gas reservoir:The lower triassic rogenstein in the netherlands[J].Journal of Petroleum Geology,2008,31(1):61-96.
[3] Zonneveld J P,Gingras M K,Beatty T W,et al.Mixed siliciclastic/carbonate systems[J].Developments in Sedimentology,2012,64:807-833.
[4] 艳萍,刘立.大港滩海区第三系湖相混积岩的成因与成岩作用特征[J].沉积学报,2003,21(4):607-613.
[5] Lokier S W,Wilson M E J,Burton L M.Marine biota response to clastic sediment influx:A quantitative approach[J].Palaeogeography,Palaeoclimatology,Palaeoecology,2009,281(1):25-42.
[6] Campbell A E.Shelf-geometry response to changes in relative sea level on a mixed carbonate-siliciclastic shelf in the Guyana Basin[J].Sedimentary Geology,2005,175(1/4):259-275.
[7] Mount J F.Mixing of siliciclastic and carbonate sediments in shallow shelf environments [J].Geology,1984,12(7):432-435.
[8] García-Hidalgo J F,Gil J,Segura M,et al.Internal anatomy of a mixed siliciclastic-carbonate platform:The Late Cenomanian-Mid Turonian at the southern margin of the Spanish Central System[J].Sedimentology,2010,54(6):1245-1271.
[9] 张雄华.混积岩的分类和成因[J].地质科技情报,2000,19(4):31-34.
[10] 沙庆安.混合沉积和混积岩的讨论[J].古地理学报,2001,3(3):63-66.
[11] 梅冥相,刘智荣,孟庆芬,等.南口虎峪中元古界大红峪组混积岩系的层序地层划分:海侵砂岩中的微生物席碎片简介[J].地质科技情报,2007,26(1):33-40.
[12] Lubeseder S,Redfern J,Boutib L.Mixed siliciclastic-carbonate shelf sedimentation:Lower Devonian sequences of the SW Anti-Atlas,Morocco[J].Sedimentary Geology,2009,215(1/4):13-32.
[13] Brandano M,Tomassetti L,Bosellini F,et al.Depositional model and paleodepth reconstruction of a coral-rich,mixed siliciclastic-carbonate system:The Burdigalian of Capo Testa (northern Sardinia,Italy)[J].Facies,2010,56(3):433-444.
[14]Feng J,Cao J,Hu K,et al.Dissolution and its impacts on reservoir formation in moderately to deeply buried strata of mixed siliciclastic-carbonate sediments,northwestern Qaidam Basin,northwest China[J].Marine & Petroleum Geology,2013,39(1):124-137.
[15] 司马立强,杨毅,吴丰,等.柴西北小梁山地区混积岩测井岩性识别[J].地质科技情报,2014,33(2):180-185.
[16] 谭梦琪,刘自亮,沈芳,等.四川盆地回龙地区下侏罗统自流井组大安寨段混积岩特征及模式[J].沉积学报,2016,34(3):571-581.
[17] 张娣,侯中健,王亚辉,等.板桥-北大港地区沙河街组沙一段湖相碳酸盐岩沉积特征[J].岩性油气藏,2008,20(4):92-97.
[18] 徐伟,陈开远,曹正林,等.咸化湖盆混积岩成因机理研究[J].岩石学报,2014,30(6):1804-1816.
[19] 王杰琼,刘波,罗平,等.塔里木盆地西北缘震旦系混积岩类型及成因[J].成都理工大学学报:自然科学版,2014,41(3):339-346.
[20] 官大勇,魏刚,王粤川,等.渤海海域渤中地区中深层储层控制因素分析:以石臼坨凸起东段陡坡带沙河街组为例[J].天然气勘探与开发,2012,35(2):5-7.
[21] 吴小红,韦阿娟,王应斌,等.渤海海域QHD32-6亿吨级大油田的形成条件分析[J].地质科技情报,2015,34(1):112-117.
[22] 刘志刚,周心怀,李建平,等.渤海海域石臼坨凸起东段36-3构造古近系沙二段储集层特征及控制因素[J].石油与天然气地质,2011,32(6):832-838.
[23] 李倩文,金振奎,姜福杰,等.白云岩成因碳氧同位素分析方法初探:以北京燕山地区元古界白云岩为例[J].岩性油气藏,2014,26(4):117-122.
[24] 盛军,孙卫,解腾云,等.苏里格气田东南部盒8段储层成岩作用研究及其孔隙演化模式定量分析[J].地质科技情报,2015,34(1):20-27.
[25] 黎盼,孙卫,高永利,等.致密砂岩储层差异性成岩演化对孔隙度定量演化表征影响:以鄂尔多斯盆地马岭地区长81储层为例[J].地质科技情报,2018,37(1):135-142.
[26] Wilson J C,Mcbride E F.Compaction and porosity evolution of Pliocene sandstones,Ventura basin,California[J].AAPG Bulletin American Association of Petroleum Geologists,1988,72(6):664-681.
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