廊固凹陷大兴断裂带沙四——沙三段近岸水下扇沉积特征
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摘要
廊固凹陷大兴断裂带相继发现兴8、兴9等砾岩油气藏,油气资源丰富,且多数油气藏处于近岸水下扇扇中辫状水道微相,因此对大兴断裂带近岸水下扇的沉积特征进行研究显得尤为重要。综合前人研究成果和廊固凹陷最近获取的岩心、地震、测井等资料,对近岸水下扇进行了沉积微相特征的识别及沉积微相类型的划分,总结了近岸水下扇分布特征,并分别建立了碎屑流及泥石流近岸水下扇沉积模式。碎屑流近岸水下扇在旧州地区发育,扇体表现为厚层砾岩与泥岩的突变接触,沉积物主要是颗粒支撑砾岩,杂基含量很少;而泥石流近岸水下扇在固安地区发育,扇体几乎无水道发育,沉积物主要为杂基支撑砾岩,杂基主要为泥质。碎屑流近岸水下扇识别出扇根主水道、扇根水道间、扇中辫状水道、扇中辫状水道间、扇端席状砂和扇端泥6种沉积微相,其中扇中辫状水道微相是扇中甚至整个碎屑流近岸水下扇的主体,扇端亚相相对不发育。近岸水下扇整体上沿大兴断层呈近北东—南西向展布,在沙三下亚段最为发育。
Conglomerate reservoirs with abundant oil and gas resources have been found in Daxing fault zone successively such as Xing 8 and Xing 9 etc. Most of these reservoirs are mid-fan braided channel of nearshore subaqueous fans. Therefore, it is very important to studythe sedimentary characteristics of the nearshore subaqueous fans. Based on the previous research results and the latest core,seismic, welllogging and other data obtained in the sag, the sedimentary microfacies are identified and classified in this paper. The vertical and horizon-tal distributions of the nearshore subaqueous fans are summarized and the depositional models of them are established for debris flow andmud flow, respectively. The debris flow nearshore subaqueous fan is developed in Jiuzhou area with an abrupt contact between the thickconglomerate and mudstone in the fan body. The sediments are mainly composed of particle-supporting conglomerates with little matrix.Whereas, the mud flow nearshore subaqueous fan is found in Gu'an area. Few channel exists in the fan and the sediments are mainly matrix-supporting conglomerates with the matrix dominated by mud. The debris flow nearshore subaqueous fan can be classified into six sedimen-tary microfacies such as main channel of root fan, interchannel of root fan, braided channel in midfan, braided interchannel in midfan,sheet sand in endfan and mud in endfan, among which the braided channel in midfan is the main body of the midfan and even the debrisflow nearshore subaqueous fans. The endfan is relatively undeveloped. The nearshore subaqueous fans are in near NE trending distributionalong Daxing fault zone with the lower third member of Shahejie formation being the most developed.
Conglomerate reservoirs with abundant oil and gas resources have been found in Daxing fault zone successively such as Xing 8 and Xing 9 etc. Most of these reservoirs are mid-fan braided channel of nearshore subaqueous fans. Therefore, it is very important to studythe sedimentary characteristics of the nearshore subaqueous fans. Based on the previous research results and the latest core,seismic, welllogging and other data obtained in the sag, the sedimentary microfacies are identified and classified in this paper. The vertical and horizon-tal distributions of the nearshore subaqueous fans are summarized and the depositional models of them are established for debris flow andmud flow, respectively. The debris flow nearshore subaqueous fan is developed in Jiuzhou area with an abrupt contact between the thickconglomerate and mudstone in the fan body. The sediments are mainly composed of particle-supporting conglomerates with little matrix.Whereas, the mud flow nearshore subaqueous fan is found in Gu'an area. Few channel exists in the fan and the sediments are mainly matrix-supporting conglomerates with the matrix dominated by mud. The debris flow nearshore subaqueous fan can be classified into six sedimen-tary microfacies such as main channel of root fan, interchannel of root fan, braided channel in midfan, braided interchannel in midfan,sheet sand in endfan and mud in endfan, among which the braided channel in midfan is the main body of the midfan and even the debrisflow nearshore subaqueous fans. The endfan is relatively undeveloped. The nearshore subaqueous fans are in near NE trending distributionalong Daxing fault zone with the lower third member of Shahejie formation being the most developed.
引文
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[15]周锦明.廊固凹陷三维叠前连片处理解释一体化及油气地质整体评价和规模目标优选[R].河北任丘:华北油田分公司,2011:68.ZHOU Jinming.The 3D prestack contiguous integrated processing and interpretation overall geological evaluation of oil and gas and multi-target optimization in Langgu depression[R].Renqiu,Hebei:Development Department,Huabei Oilfield Company,Petro China,2011:68.
[16]刘晖,姜在兴,张锐锋,等.廊固凹陷大兴砾岩体成因类型及其对油气的控制[J].石油勘探与开发,2012,39(5):546-548.LIU Hui,JIANG Zaixing,ZHANG Ruifeng,et al.Genetic types of Daxing conglomerate bodies and their controls on hydrocarbons in the Langgu sag,Bohai Bay basin,East China[J].Petroleum Exploration and Development,2012,39(5):546-548.
[17]孟鹏.埕北断阶区沙河街组近岸水下扇-浊积扇沉积特征及其控制因素[D].长春:吉林大学,2006:9-17.MENG Peng.The sedimentary characteristics and its control factors of nearshore subaqueous fan-turbiditefan in the Shahejie formation of Chengbei fault-step zone[D].Changchun:Jilin University,2006:9-17.
[18]孙宏烨.廊固凹陷大兴砾岩体沙三段储层综合评价[D].北京:中国石油大学,2011.SUN Hongye.The comprehensive evaluation of reservoir of Es3 in Daxing conglomerate body,Langgu depression[D].Beijing:China University of Petroleum,2011.
[2]曾洪流,张万选,张厚福.廊固凹陷沙三段主要沉积体的地震相和沉积相特征[J].石油学报,1988,9(2):12-18.ZENG Hongliu,ZHANG Wanxuan,ZHANG Houfu.Seismic and depositional characteristics of major sedimentary bodies in 3rd section of Shahejie formation Longgu depression[J].Acta Petrolei Sinica,1988,9(2):12-18.
[3]朱筱敏.沉积岩石学[M].北京:石油工业出版社,2008:229-234.ZHU Xiaomin.Sedimentary petrology[M].Beijing:Petroleum Industry Press,2008:229-234.
[4]鄢继华,陈世悦,姜在兴.东营凹陷北部陡坡带近岸水下扇沉积特征[J].石油大学学报(自然科学版),2005,29(1):12-16.YAN Jihua,CHEN Shiyue,JIANG Zaixing.Sedimentary characteristic of nearshore subaqueous fans in steep slope of Dongying depression[J].Journal of the University of Petroleum,China,2005,29(1):12-16.
[5]鲜本忠,姜在兴,高凤珍.河南泌阳凹陷古近系核桃园组核二段沉积体系[J].古地理学报,2002,4(2):31-37.XIAN Benzhong,JIANG Zaixing,GAO Fengzhen.Sedimentary systems in the member 2 of Hetaoyuan formation of Paleogene in Biyang depression of Henan Province[J].Journal of Palaeogeography,2002,4(2):31-37.
[6]朱筱敏,董艳蕾,胡廷惠,等.精细层序地层格架与地震沉积学研究——以泌阳凹陷核桃园组为例[J].石油与天然气地质,2011,32(4):615-624.ZHU Xiaomin,DONG Yanlei,HU Tinghui,et al.Seismic sedimentology study of fine sequence stratigraphic framework:a case study of the Hetaoyuan formation in the Biyang sag[J].Oil&Gas Geology,2011,32(4):615-624.
[7]秦中正,秦飞,金燕林,等.王集油田沉积特征与沉积微相展布研究[J].石油地质与工程,2013,27(6):30-33.QIN Zhongzheng,QIN Fei,JIN Yanlin,et al.Study on sedimentary characteristics and sedimentary microfacies distribution of Wangji oilfield[J].Petroleum Geology and Engineering,2013,27(6):30-33.
[8]朱筱敏,查明,张卫海,等.陆西凹陷上侏罗统近岸水下扇沉积特征[J].石油大学学报(自然科学版),1995,19(1):1-6.ZHU Xiaomin,ZHA Ming,ZHANG Weihai,et al.Sedimentary features of Upper Jurassic nearshore subaqueous fan in Luxi depression[J].Journal of the University of Petroleum,China,1995,19(1):1-6.
[9]王良忱,张金亮.沉积环境和沉积相[M].北京:石油工业出版社,1996:54-56.WANG Liangchen,ZHANG Jinliang.Environment of sedimentation and sedimentary facies[M].Beijing:Petroleum Industry Press,1996:54-56.
[10]朱庆忠,李春华,杨合义.廊固凹陷大兴砾岩体成因与油气成藏[J].石油勘探与开发,2003,30(4):34-36.ZHU Qingzhong,LI Chunhua,YANG Heyi.The origin and hydrocarbon accumulation of Daxing conglomerate body in Langgu depression[J].Petroleum Exploration and Development,2003,30(4):34-36.
[11]宋荣彩,张哨楠,董树义,等.廊固凹陷近岸水下扇特征及控制因素[J].地球科学与环境学报,2007,29(2):146-148.SONG Rongcai,ZHANG Shaonan,DONG Shuyi,et al.Characteristics and controlling factors analyze of nearshore subaqueous fans in Langgu depression[J].Journal of Earth Sciences and Environment,2007,29(2):146-148.
[12]刘晖.廊固凹陷古近纪大兴砾岩体沉积特征及成因[D].北京:中国地质大学,2011.LIU Hui.Sedimentary characteristics and genesis of the Paleogene Daxing conglomerate in Langgu sag[D].Beijing:China University of Geosciences,2011.
[13]赵伟森,武耀辉,曹建华,等.廊固凹陷大兴砾岩体成藏差异性特征研究[J].石油地质,2012,17(6):43-47.ZHAO Weisen,WU Yaohui,CAO Jianhua,et al.Research on the characteristics of the difference of Daxing conglomeratic reservoir in Langgu sag[J].Petroleum Geology,2012,17(6):43-47.
[14]刁帆,邹华耀,郝芳,等.渤海湾盆地廊固凹陷烃源岩特征及其发育模式[J].石油与天然气地质,2014,35(3):326-335.DIAO Fan,ZOU Huayao,HAO Fang,et al.Characteristics and depositional models source rocks in Langgu sag,Bohai Bay basin[J].Oil&Gas Geology,2014,35(3):326-335.
[15]周锦明.廊固凹陷三维叠前连片处理解释一体化及油气地质整体评价和规模目标优选[R].河北任丘:华北油田分公司,2011:68.ZHOU Jinming.The 3D prestack contiguous integrated processing and interpretation overall geological evaluation of oil and gas and multi-target optimization in Langgu depression[R].Renqiu,Hebei:Development Department,Huabei Oilfield Company,Petro China,2011:68.
[16]刘晖,姜在兴,张锐锋,等.廊固凹陷大兴砾岩体成因类型及其对油气的控制[J].石油勘探与开发,2012,39(5):546-548.LIU Hui,JIANG Zaixing,ZHANG Ruifeng,et al.Genetic types of Daxing conglomerate bodies and their controls on hydrocarbons in the Langgu sag,Bohai Bay basin,East China[J].Petroleum Exploration and Development,2012,39(5):546-548.
[17]孟鹏.埕北断阶区沙河街组近岸水下扇-浊积扇沉积特征及其控制因素[D].长春:吉林大学,2006:9-17.MENG Peng.The sedimentary characteristics and its control factors of nearshore subaqueous fan-turbiditefan in the Shahejie formation of Chengbei fault-step zone[D].Changchun:Jilin University,2006:9-17.
[18]孙宏烨.廊固凹陷大兴砾岩体沙三段储层综合评价[D].北京:中国石油大学,2011.SUN Hongye.The comprehensive evaluation of reservoir of Es3 in Daxing conglomerate body,Langgu depression[D].Beijing:China University of Petroleum,2011.