An exploration breakthrough in Paleozoic petroleum system of Huanghua Depression in Dagang Oilfield and its significance, North China
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摘要
In recent years, several wells in the Qibei and Wumaying buried hills of Dagang Oilfield tapped oil in the Carboniferous–Permian and Ordovician strata. This major breakthrough reveals that the deep Paleozoic in the Bohai Bay is a new petroleum system. Through re-evaluating the Paleozoic source rock, reservoir-cap combinations and traps, it is found the oil and gas mainly come from Carboniferous–Permian source rock. The study shows that the Paleozoic strata are well preserved in the central-south Huanghua Depression and developed two kinds of reservoirs, Upper Paleozoic clastic rock and Lower Paleozoic carbonate rock, which form favorable source-reservoir assemblages with Carboniferous–Permian coal measure source rock. The Carboniferous–Permian coal-bearing source rock is rich in organic matters, which are mainly composed of type Ⅱ2 and Ⅲ kerogens, and minor Ⅱ1 kerogen in partial areas. Multi-stage tectonic movements resulted in two stages of hydrocarbon generation of the source rocks. The period from the deposition of Kongdian Formation to now is the second stage of hydrocarbon generation. The matching between large-scale oil and gas charging, favorable reservoir-cap combinations and stable structure determines the enrichment of oil and gas. According to the new comprehensive evaluation of Paleozoic petroleum system, the primary oil and gas resources of the Paleozoic in the Bohai Bay Basin are over 1×10~(12)m~3. The exploration breakthrough in Paleozoic petroleum system, especially Carboniferous–Permian petroleum system in Huanghua Depression is inspirational for oil and gas exploration in similar provinces of Bohai Bay Basin.
In recent years, several wells in the Qibei and Wumaying buried hills of Dagang Oilfield tapped oil in the Carboniferous–Permian and Ordovician strata. This major breakthrough reveals that the deep Paleozoic in the Bohai Bay is a new petroleum system. Through re-evaluating the Paleozoic source rock, reservoir-cap combinations and traps, it is found the oil and gas mainly come from Carboniferous–Permian source rock. The study shows that the Paleozoic strata are well preserved in the central-south Huanghua Depression and developed two kinds of reservoirs, Upper Paleozoic clastic rock and Lower Paleozoic carbonate rock, which form favorable source-reservoir assemblages with Carboniferous–Permian coal measure source rock. The Carboniferous–Permian coal-bearing source rock is rich in organic matters, which are mainly composed of type Ⅱ2 and Ⅲ kerogens, and minor Ⅱ1 kerogen in partial areas. Multi-stage tectonic movements resulted in two stages of hydrocarbon generation of the source rocks. The period from the deposition of Kongdian Formation to now is the second stage of hydrocarbon generation. The matching between large-scale oil and gas charging, favorable reservoir-cap combinations and stable structure determines the enrichment of oil and gas. According to the new comprehensive evaluation of Paleozoic petroleum system, the primary oil and gas resources of the Paleozoic in the Bohai Bay Basin are over 1×10~(12)m~3. The exploration breakthrough in Paleozoic petroleum system, especially Carboniferous–Permian petroleum system in Huanghua Depression is inspirational for oil and gas exploration in similar provinces of Bohai Bay Basin.
In recent years, several wells in the Qibei and Wumaying buried hills of Dagang Oilfield tapped oil in the Carboniferous–Permian and Ordovician strata. This major breakthrough reveals that the deep Paleozoic in the Bohai Bay is a new petroleum system. Through re-evaluating the Paleozoic source rock, reservoir-cap combinations and traps, it is found the oil and gas mainly come from Carboniferous–Permian source rock. The study shows that the Paleozoic strata are well preserved in the central-south Huanghua Depression and developed two kinds of reservoirs, Upper Paleozoic clastic rock and Lower Paleozoic carbonate rock, which form favorable source-reservoir assemblages with Carboniferous–Permian coal measure source rock. The Carboniferous–Permian coal-bearing source rock is rich in organic matters, which are mainly composed of type Ⅱ2 and Ⅲ kerogens, and minor Ⅱ1 kerogen in partial areas. Multi-stage tectonic movements resulted in two stages of hydrocarbon generation of the source rocks. The period from the deposition of Kongdian Formation to now is the second stage of hydrocarbon generation. The matching between large-scale oil and gas charging, favorable reservoir-cap combinations and stable structure determines the enrichment of oil and gas. According to the new comprehensive evaluation of Paleozoic petroleum system, the primary oil and gas resources of the Paleozoic in the Bohai Bay Basin are over 1×10~(12)m~3. The exploration breakthrough in Paleozoic petroleum system, especially Carboniferous–Permian petroleum system in Huanghua Depression is inspirational for oil and gas exploration in similar provinces of Bohai Bay Basin.
引文
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[21]WANG Tieguan,WANG Feiyu,LU Hong,et al.Origin and episodes of oil-pool formation for primary oil pools of Ordovician in Kongxi buried hill in Huanghua Depression.Marine Origin Petroleum Geology,2000,5(1/2):47-54.
[22]YANG Minghui.Diversity of buried-hills and comparison of their hydrocarbon-pooling factors in the Bohai Bay Basin.Oil&Gas Geology,2008,29(5):623-631.
[23]WU Xiaozhou,NIU Jiayu,WU Fengcheng,et al.Major control factors of hydrocarbon accumulation in Ordovician interior Buried-Hills,Bohaiwan Basin.Marine Origin Petroleum Geology,2013,18(1):1-11.
[24]ZHOU Lihong,LI Sanzhong,LIU Jianzhong,et al.Pre-Tertiary tectonic evolution of Bohai Bay basin and hydrocarbon accumulation model in buried hills.Beijing:China Science and Technology Press,2003.
[25]ZHOU Lihong,FU Lixin,LOU Da,et al.Structural anatomy and dynamics of evolution of the Qikou Sag,Bohai Bay Basin:Implications for the destruction of North China craton.Journal of Asian Earth Sciences,2012,47(30):94-106.
[26]HE Haiqing,WANG Zhaoyun,HAN Pinlong.Tectonic control on the formation and distribution of oil-gas pools in the Bohai Bay Basin of North China.Acta Geologica Sinica,1998,72(4):313-321.
[27]YU Fusheng,QI Jiafu,WANG Chunying.Tectonic deformation of Indosinian period in eastern part of north China.Journal of China University of Mining&Technology,2002,31(4):402-406.
[28]YANG Minghui,LIU Chiyang,ZENG Peng,et al.Prototypes of late Triassic sedimentary basins of north China Craton(NCC)and deformation pattern of its early destruction.Geological Review,2012,58(1):1-18.
[29]GAO Xianzhi,WU Weitao,LU Xuejun,et al.Multiplicity of hydrocarbon reservoir and accumulation controlling factors within buried hills in Jizhong Depression.Journal of China University of Petroleum(Natural Science Edition),2011,35(3):31-35.
[2]ZHAO Xianzheng,WANG Quan,JIN Fengming,et al.Main controlling factors and exploration practice of subtle buried-hill hydrocarbon reservoir in Jizhong Depression.Acta Petrolei Sinica,2012,33(1):71-79.
[3]ZHAO Xianzheng,ZHOU Lihong,PU Xiugang,et al.Development and exploration practice of the concept of hydrocarbon accumulation in rifted-basin troughs:A case study of Paleogene Kongdian Formation in Cangdong Sag,Bohai Bay Basin.Petroleum Exploration and Development,2018,45(6):1092-1102.
[4]LI Peilong,ZHANG Shanwen,WANG Yongshi,et al.Multiplex buried-hill genesis and pool-forming in rifted basin.Acta Petrolei Sinica,2004,25(3):28-31.
[5]YANG Chiyin,ZHANG Yiwei.Huanghua superimposed basin evolution and oil and gas accumulation in buried-hill.Petroleum Exploration and Development,2003,30(6):8-12.
[6]TANG Wenlian,ZHANG Wanxuan,XING Jun,et al.The lower paleozoic gas-bearing system of the Ordos Basin and its exploration direction.Experimental Petroleum Geology,2000,22(1):28-34.
[7]YANG Chiyin,YU Xuemin,LIU Yan,et al.Geological condition of coal-derived gas accumulation and exploration prospect in the Carboniferous-Permian covered area from south central of Huanghua Depression in Bohai Bay Basin.Natural Gas Geoscience,2014,25(1):23-31.
[8]WU Yongping,FU Lixin,YANG Chiyin,et al.Effect of Mesozoic tectonic evolution on hydrocarbon accumulation in buried huills in Huanghua Depression.Acta Petrolei Sinica,2002,23(2):16-21.
[9]WANG Wen’ge,ZHENG Yumei,FENG Jianyuan,et al.Buried hills developed in Qikou Sag and their oil and gas accumulation prospect.Mud Logging Engineering,2012,23(3):93-97.
[10]FU Lixin,LOU Da,FENG Jianyuan,et al.Geologic features and hydrocarbon exploration potential of middle and low-buried hill in Qikou Sag.Natural Gas Geoscience,2010,21(4):559-565.
[11]ZHAO Xianzheng,WU Zhaohui,YAN Baoyi,et al.Distribution and types of buried hill oil-gas reservoir in Jizhong Depression.Xinjiang Petroleoum Geology,2010,31(1):4-6.
[12]ZHAO Xianzheng,WANG Quan,JIN Fengming,et al.Main controlling factors and exploration practice of subtle buriedhill hydrocarbon reservoir in Jizhong Depression.Acta Petrolei Sinica,2012,33(1):71-70.
[13]ZHAO Xianzheng,JIN Fengming,CUI Zhouqi,et al.Types of subtle buried-hill oil reservoirs and their accumulation simulation in Jizhong Depression,Bohai Bay Basin.Petroleum Exploration and Development,2012,39(2):137-143.
[14]MENG Weigong,CHEN Zhenyan,LI Pai,et al.Exploration theories and practices of buried-hill reservoirs:A case from Liaohe Depressions.Petroleum Exploration and Development,2009,36(2):136-142.
[15]XIE Wenyan,MENG Weigong,ZHANG Zhanwen,et al.Formation model of multi stage faracture reservoirs inside the buried hills in Liaohe Depression.Petroleum Exploration and Development,2006,33(6):649-652.
[16]SHI Hesheng,WANG Qingbin,WANG Jun,et al.Discovery and exploration significance of large condensate gas fields in BZ19-6 structure in deep Bozhong Sag.China Petroleum Exploration,2019,24(1):36-45.
[17]XU Changgui,YU Haibo,WANG Jun,et al.Formation conditions and accumulation characteristics of Bozhong 19-6large condensate gas field in offshore Bohai Bay Basin.Petroleum Exploration and Development,2019,46(1):25-37.
[18]DU Xiaodi,YAO Chao.Discovery and significance of Banqiao-Beidagang berried hills in Dagang Oilfield.Marine Origin Petroleum Geology,1999,4(3):8-10.
[19]ZHU Ziqiang,LU Gangchen,LI Yuhai,et al.Reservoirs characteristics and exploration prospect in the flank zone of buried hills,northern Dagang.Oil Geophysical Prospecting,2015,50(1):150-155.
[20]ZHAO Xianzheng,ZHOU Lihong,PU Xiugang,et al.Hydrocarbon-generating potential of the upper Paleozoic section of the Huanghua Depression,Bohai Bay Basin,China.Energy&Fuels,2018,32(12):12351-12364.
[21]WANG Tieguan,WANG Feiyu,LU Hong,et al.Origin and episodes of oil-pool formation for primary oil pools of Ordovician in Kongxi buried hill in Huanghua Depression.Marine Origin Petroleum Geology,2000,5(1/2):47-54.
[22]YANG Minghui.Diversity of buried-hills and comparison of their hydrocarbon-pooling factors in the Bohai Bay Basin.Oil&Gas Geology,2008,29(5):623-631.
[23]WU Xiaozhou,NIU Jiayu,WU Fengcheng,et al.Major control factors of hydrocarbon accumulation in Ordovician interior Buried-Hills,Bohaiwan Basin.Marine Origin Petroleum Geology,2013,18(1):1-11.
[24]ZHOU Lihong,LI Sanzhong,LIU Jianzhong,et al.Pre-Tertiary tectonic evolution of Bohai Bay basin and hydrocarbon accumulation model in buried hills.Beijing:China Science and Technology Press,2003.
[25]ZHOU Lihong,FU Lixin,LOU Da,et al.Structural anatomy and dynamics of evolution of the Qikou Sag,Bohai Bay Basin:Implications for the destruction of North China craton.Journal of Asian Earth Sciences,2012,47(30):94-106.
[26]HE Haiqing,WANG Zhaoyun,HAN Pinlong.Tectonic control on the formation and distribution of oil-gas pools in the Bohai Bay Basin of North China.Acta Geologica Sinica,1998,72(4):313-321.
[27]YU Fusheng,QI Jiafu,WANG Chunying.Tectonic deformation of Indosinian period in eastern part of north China.Journal of China University of Mining&Technology,2002,31(4):402-406.
[28]YANG Minghui,LIU Chiyang,ZENG Peng,et al.Prototypes of late Triassic sedimentary basins of north China Craton(NCC)and deformation pattern of its early destruction.Geological Review,2012,58(1):1-18.
[29]GAO Xianzhi,WU Weitao,LU Xuejun,et al.Multiplicity of hydrocarbon reservoir and accumulation controlling factors within buried hills in Jizhong Depression.Journal of China University of Petroleum(Natural Science Edition),2011,35(3):31-35.