研究珠江口盆地HZ26-6构造“双古”领域油气成藏期次和油气成藏条件,探讨油气成藏特点与富集规律。在借鉴前人研究成果的基础上,通过铸体薄片鉴定、包裹体均一温度测定等手段,厘清了HZ26-6构造“双古”领域三大油气主力成藏期及对应的...研究珠江口盆地HZ26-6构造“双古”领域油气成藏期次和油气成藏条件,探讨油气成藏特点与富集规律。在借鉴前人研究成果的基础上,通过铸体薄片鉴定、包裹体均一温度测定等手段,厘清了HZ26-6构造“双古”领域三大油气主力成藏期及对应的流体充注类型,即13.8~10 Ma B.P.的低熟原油充注期,10~5.3 Ma B.P.的成熟原油充注期,5.3 Ma B.P.以来的天然气充注期;依据实际的地质、钻井、测井、地震等资料梳理了HZ26-6构造“双古”领域三大油气成藏关键条件,即以“早期低熟缓慢生油,晚期高熟快速生气”为特点的烃源条件,以“裂缝带风化叠加改造成储,转换带砂砾岩体规模成储”为特征的储层条件,以“通源断裂多期跨层输导,深缝浅砂侧向差异运移”为特征的输导条件。HZ26-6构造“双古”领域具有“早油晚气,宽窗强供;扇加潜山,规模储集;断缝断砂,高效输导;递进充注,整装成藏”的油气成藏特点,以及“油型盆地早油晚气条件下,宽窗强势供烃、‘双古’整装成藏”的油气富集规律。展开更多
Based on the practice of oil and gas exploration in the Huizhou Sag of the Pearl River Mouth Basin,the geochemical indexes of source rocks were measured,the reservoir development morphology was restored,the rocks and ...Based on the practice of oil and gas exploration in the Huizhou Sag of the Pearl River Mouth Basin,the geochemical indexes of source rocks were measured,the reservoir development morphology was restored,the rocks and minerals were characterized microscopically,the measured trap sealing indexes were compared,the biomarker compounds of crude oil were extracted,the genesis of condensate gas was identified,and the reservoir-forming conditions were examined.On this basis,the Paleogene Enping Formation in the Huizhou 26 subsag was systematically analyzed for the potential of oil and gas resources,the development characteristics of large-scale high-quality conglomerate reservoirs,the trapping effectiveness of faults,the hydrocarbon migration and accumulation model,and the formation conditions and exploration targets of large-and medium-sized glutenite-rich oil and gas fields.The research results were obtained in four aspects.First,the Paleogene Wenchang Formation in the Huizhou 26 subsag develops extensive and thick high-quality source rocks of semi-deep to deep lacustrine subfacies,which have typical hydrocarbon expulsion characteristics of"great oil generation in the early stage and huge gas expulsion in the late stage",providing a sufficient material basis for hydrocarbon accumulation in the Enping Formation.Second,under the joint control of the steep slope zone and transition zone of the fault within the sag,the large-scale near-source glutenite reservoirs are highly heterogeneous,with the development scale dominated hierarchically by three factors(favorable facies zone,particle component,and microfracture).The(subaqueous)distributary channels near the fault system,with equal grains,a low mud content(<5%),and a high content of feldspar composition,are conducive to the development of sweet spot reservoirs.Third,the strike-slip pressurization trap covered by stable lake flooding mudstone is a necessary condition for oil and gas preservation,and the NE and nearly EW faults obliquely to the principal stress have the best control on traps.Fourth,the spatiotemporal configuration of high-quality source rocks,fault transport/sealing,and glutenite reservoirs controls the degree of hydrocarbon enrichment.From top to bottom,three hydrocarbon accumulation units,i.e.low-fill zone,transition zone,and high-fill zone,are recognized.The main area of the channel in the nearly pressurized source-connecting fault zone is favorable for large-scale hydrocarbon enrichment.The research results suggest a new direction for the exploration of large-scale glutenite-rich reservoirs in the Enping Formation of the Pearl River Mouth Basin,and present a major breakthrough in oil and gas exploration.展开更多
文摘研究珠江口盆地HZ26-6构造“双古”领域油气成藏期次和油气成藏条件,探讨油气成藏特点与富集规律。在借鉴前人研究成果的基础上,通过铸体薄片鉴定、包裹体均一温度测定等手段,厘清了HZ26-6构造“双古”领域三大油气主力成藏期及对应的流体充注类型,即13.8~10 Ma B.P.的低熟原油充注期,10~5.3 Ma B.P.的成熟原油充注期,5.3 Ma B.P.以来的天然气充注期;依据实际的地质、钻井、测井、地震等资料梳理了HZ26-6构造“双古”领域三大油气成藏关键条件,即以“早期低熟缓慢生油,晚期高熟快速生气”为特点的烃源条件,以“裂缝带风化叠加改造成储,转换带砂砾岩体规模成储”为特征的储层条件,以“通源断裂多期跨层输导,深缝浅砂侧向差异运移”为特征的输导条件。HZ26-6构造“双古”领域具有“早油晚气,宽窗强供;扇加潜山,规模储集;断缝断砂,高效输导;递进充注,整装成藏”的油气成藏特点,以及“油型盆地早油晚气条件下,宽窗强势供烃、‘双古’整装成藏”的油气富集规律。
基金Supported by the CNOOC Major Technology Project During the 14th FIVE-YEAR PLAN PERIOD(KJGG2022-0403)CNOOC Major Technology Project(KJZH-2021-0003-00).
文摘Based on the practice of oil and gas exploration in the Huizhou Sag of the Pearl River Mouth Basin,the geochemical indexes of source rocks were measured,the reservoir development morphology was restored,the rocks and minerals were characterized microscopically,the measured trap sealing indexes were compared,the biomarker compounds of crude oil were extracted,the genesis of condensate gas was identified,and the reservoir-forming conditions were examined.On this basis,the Paleogene Enping Formation in the Huizhou 26 subsag was systematically analyzed for the potential of oil and gas resources,the development characteristics of large-scale high-quality conglomerate reservoirs,the trapping effectiveness of faults,the hydrocarbon migration and accumulation model,and the formation conditions and exploration targets of large-and medium-sized glutenite-rich oil and gas fields.The research results were obtained in four aspects.First,the Paleogene Wenchang Formation in the Huizhou 26 subsag develops extensive and thick high-quality source rocks of semi-deep to deep lacustrine subfacies,which have typical hydrocarbon expulsion characteristics of"great oil generation in the early stage and huge gas expulsion in the late stage",providing a sufficient material basis for hydrocarbon accumulation in the Enping Formation.Second,under the joint control of the steep slope zone and transition zone of the fault within the sag,the large-scale near-source glutenite reservoirs are highly heterogeneous,with the development scale dominated hierarchically by three factors(favorable facies zone,particle component,and microfracture).The(subaqueous)distributary channels near the fault system,with equal grains,a low mud content(<5%),and a high content of feldspar composition,are conducive to the development of sweet spot reservoirs.Third,the strike-slip pressurization trap covered by stable lake flooding mudstone is a necessary condition for oil and gas preservation,and the NE and nearly EW faults obliquely to the principal stress have the best control on traps.Fourth,the spatiotemporal configuration of high-quality source rocks,fault transport/sealing,and glutenite reservoirs controls the degree of hydrocarbon enrichment.From top to bottom,three hydrocarbon accumulation units,i.e.low-fill zone,transition zone,and high-fill zone,are recognized.The main area of the channel in the nearly pressurized source-connecting fault zone is favorable for large-scale hydrocarbon enrichment.The research results suggest a new direction for the exploration of large-scale glutenite-rich reservoirs in the Enping Formation of the Pearl River Mouth Basin,and present a major breakthrough in oil and gas exploration.
