东营凹陷深层裂解气成藏主控因素
|
摘要
东营凹陷深层裂解气藏为凝析气藏和纯气藏,气源来源于沙四下亚段高成熟烃源岩。通过分析化验、测井、地震等资料综合研究了裂解气成藏控制因素。研究表明,地温直接控制油气生成、烃类相态和气藏分布;近岸水下扇相扇中辫状水道和前缘微相储集层物性较好,是裂解气成藏的主要储集层,溶蚀作用改善了储集层条件,提高了含气性;流体势控制了油气运移和聚集成藏,由凹陷中心的高势区向边部低势区运移,在断裂陡坡带有利相带的砂砾岩体中聚集形成裂解气藏。东营凹陷北部断裂陡坡带是深层裂解气富集和分布的区带,也是近期深层天然气勘探的方向。
The deep cracked gas pool in Dongying sag is characterized by condensate gas reservoir and net gas reservoir. The gas source originates from high matured source rock of the lower sub-section of Es4. The factors controlling the cracked gas accumulation are studied by lab experiment,well log and seismic data analyses. Study shows that the hydrocarbon generation,hydrocarbon phase state and gas reservoir distribution are all controlled by in-situ geotemperature; the main reservoirs for the cracked gas accumulation are the mid-fan braided channel microfacies and front microfacies in nearshore submerged fan facies,and the reservoirs' conditions are improved by solution process,hence rising the gas-bearing property in them; the hydrocarbon migration and accumulation are controlled by the fluid potentials,allowing hydrocarbons to migrate from high potential zone in sag center to low potential zone at verges,finally to accumulate in the glutenites of favorable facies zones in faulted abrupt slope belt. It is concluded that the faulted abrupt slope belt in northern Dongying sag is an area for the deep cracked gas enrichment and distribution,thus it is also as a target for deep natural gas prospecting in the near future.
The deep cracked gas pool in Dongying sag is characterized by condensate gas reservoir and net gas reservoir. The gas source originates from high matured source rock of the lower sub-section of Es4. The factors controlling the cracked gas accumulation are studied by lab experiment,well log and seismic data analyses. Study shows that the hydrocarbon generation,hydrocarbon phase state and gas reservoir distribution are all controlled by in-situ geotemperature; the main reservoirs for the cracked gas accumulation are the mid-fan braided channel microfacies and front microfacies in nearshore submerged fan facies,and the reservoirs' conditions are improved by solution process,hence rising the gas-bearing property in them; the hydrocarbon migration and accumulation are controlled by the fluid potentials,allowing hydrocarbons to migrate from high potential zone in sag center to low potential zone at verges,finally to accumulate in the glutenites of favorable facies zones in faulted abrupt slope belt. It is concluded that the faulted abrupt slope belt in northern Dongying sag is an area for the deep cracked gas enrichment and distribution,thus it is also as a target for deep natural gas prospecting in the near future.
引文
[1]戴金星,裴锡古,戚厚发.中国天然气地质学(卷一)[M].北京:石油工业出版社,1992.
[2]徐永昌.天然气成因理论及应用[M].北京:科学出版社,1994.
[3]李孝军,李文涛,张海君.济阳坳陷裂解气成藏分析及勘探方向[J].油气地质与采收率,2005,12(1):42-45.
[4]李丕龙.陆相断裂盆地油气地质与勘探(卷三)[M].北京:石油工业出版社,2003.
[5]赵文智,王兆云,张水昌,等.有机质“接力成气”模式的提出及其勘探中的意义[J].石油勘探与开发,2005,32(2):1-7.
[6]王志刚.东营凹陷北部陡坡带构造岩相带油气成藏模式[J].石油勘探与开发,2003,30(4):10-13.
[7]杨晓宁,陈洪德,寿建峰,等.碎屑岩次生孔隙形成机制[J].大庆石油学院学报,2004,28(1):4-6.
[8]金爱民,楼章华,朱蓉,等.地下水动力场的形成、演化及其流体特征分析[J].浙江大学学报(理学版),2003,30(3):337-342.
[2]徐永昌.天然气成因理论及应用[M].北京:科学出版社,1994.
[3]李孝军,李文涛,张海君.济阳坳陷裂解气成藏分析及勘探方向[J].油气地质与采收率,2005,12(1):42-45.
[4]李丕龙.陆相断裂盆地油气地质与勘探(卷三)[M].北京:石油工业出版社,2003.
[5]赵文智,王兆云,张水昌,等.有机质“接力成气”模式的提出及其勘探中的意义[J].石油勘探与开发,2005,32(2):1-7.
[6]王志刚.东营凹陷北部陡坡带构造岩相带油气成藏模式[J].石油勘探与开发,2003,30(4):10-13.
[7]杨晓宁,陈洪德,寿建峰,等.碎屑岩次生孔隙形成机制[J].大庆石油学院学报,2004,28(1):4-6.
[8]金爱民,楼章华,朱蓉,等.地下水动力场的形成、演化及其流体特征分析[J].浙江大学学报(理学版),2003,30(3):337-342.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心