大巴山前缘地区龙王庙组油气成藏条件
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摘要
川中地区龙王庙组的天然气勘探已经取得重大发现,然而大巴山前缘地区龙王庙组尚未取得勘探突破,原因可能是缺少油气成藏条件研究。从烃源岩、沉积相、储层、构造条件等多方面入手,探讨了该区龙王庙组的油气成藏条件,结果表明:(1)该区寒武系发育筇竹寺组优质烃源岩,烃源条件较好;(2)该区龙王庙组储层主要储集空间为粒间溶孔、晶间溶孔,储层呈现低孔、低渗特征,大巴山前缘地区龙王庙组的储层主要发育在台缘带颗粒滩叠合岩溶发育区城口—奉节—兴山—利川一带;(3)该区寒武系油气成藏条件好,"筇竹寺组烃源岩+龙王庙组储层+高台组厚层膏盐岩盖层"这套优越生储盖组合为油气藏的形成奠定了基础。圈闭形成时间与油气运移匹配,有利于油气聚集。在成藏条件分析的基础上,认为城口—巫山地区为大巴山前缘地区龙王庙组的有利勘探区带。
Significant natural gas has been discovered in the Longwangmiao Formation of the central Sichuan Basin.However,the Longwangmiao Formation in the front area of the Daba Mountain has remained an area lacking breakthrough.In this paper,we made a thorough review of the hydrocarbon accumulation conditions started from source rock,followed by sedimentary facies,reservoirs,structural conditions and other aspects,and discussed the hydrocarbon accumulation conditions of the Longwangmiao Formation in the front area of the Daba Mountain.Our results suggest that:(1)High-quality source rocks do occur in the Qiongzhusi Formation of Cambrian in this area and may provide good organic matters for hydrocarbon generation;(2)The main reservoir space of the Longwangmiao Formation in the study area are intergranular and intercrystalline dissolved pores with low porosity and low permeability.Reservoirs,however,may well developed in the Chengkou-Fengjie-Xingshan-Lichuan area where karstified carbonate beaches are well developed along the margin of platforms.(3)There are favorable assemblages of oil and gas accumulation conditions in the Cambrian of the region,which include the source rocks from Qiongzhusi Formation,reservoir of Longwangmiao Formation and a thick salt cover of Gaotai Formation.Trap forming time matches well with the timing of oil and gas migration,which is conducive to oil and gas accumulation.Based on the study of hydrocarbon accumulation conditions,it is believed that the Chengkou-Wushan area is the most favorable area for future oil and gas exploration.
Significant natural gas has been discovered in the Longwangmiao Formation of the central Sichuan Basin.However,the Longwangmiao Formation in the front area of the Daba Mountain has remained an area lacking breakthrough.In this paper,we made a thorough review of the hydrocarbon accumulation conditions started from source rock,followed by sedimentary facies,reservoirs,structural conditions and other aspects,and discussed the hydrocarbon accumulation conditions of the Longwangmiao Formation in the front area of the Daba Mountain.Our results suggest that:(1)High-quality source rocks do occur in the Qiongzhusi Formation of Cambrian in this area and may provide good organic matters for hydrocarbon generation;(2)The main reservoir space of the Longwangmiao Formation in the study area are intergranular and intercrystalline dissolved pores with low porosity and low permeability.Reservoirs,however,may well developed in the Chengkou-Fengjie-Xingshan-Lichuan area where karstified carbonate beaches are well developed along the margin of platforms.(3)There are favorable assemblages of oil and gas accumulation conditions in the Cambrian of the region,which include the source rocks from Qiongzhusi Formation,reservoir of Longwangmiao Formation and a thick salt cover of Gaotai Formation.Trap forming time matches well with the timing of oil and gas migration,which is conducive to oil and gas accumulation.Based on the study of hydrocarbon accumulation conditions,it is believed that the Chengkou-Wushan area is the most favorable area for future oil and gas exploration.
引文
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[15]杨跃明,文龙,罗冰,等.四川盆地达州—开江古隆起沉积构造演化及油气成藏条件分析[J].天然气工业,2016,36(8):1-10.
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[3]姚根顺,周进高,邹伟宏,等.四川盆地下寒武统龙王庙组颗粒滩特征及分布规律[J].海相油气地质,2013,18(4):1-8.
[4]杜金虎,邹才能,徐春春,等.川中古隆起龙王庙组特大型气田战略发展与理论技术创新[J].石油勘探与开发,2014,41(3):268-277.
[5]杨雪飞,王兴志,杨跃明,等.川中地区下寒武统龙王庙组白云岩储集层成岩作用[J].地质科技情报,2015,34(1):35-41.
[6]冉隆辉,谢姚祥,戴弹申.四川盆地东南部寒武系含油气前景新认识[J].天然气工业,2008,28(5):5-9.
[7]刘满仓,杨威,李其荣,等.四川盆地蜀南地区寒武系地层划分及对比研究[J].天然气地球科学,2008,19(1):100-106.
[8]洪海涛,杨雨,刘鑫,等.四川盆地海相碳酸盐岩储集层特征及控制因素[J].石油学报,2012,33(2):64-73.
[9]刘树根,宋金民,赵异华,等.四川盆地龙王庙组优质储集层形成与分布的主控因素[J].成都理工大学学报:自然科学版,2014,41(6):657-671.
[10]任影,钟大康,高崇龙,等.川东及其周缘地区下寒武统龙王庙组沉积相[J].古地理学报,2015,17(3):335-346.
[11]任影,钟大康,高崇龙,等.川东及其周缘地区下寒武统龙王庙组储集层特征与控制因素[J].古地理学报,2015,17(6):829-840.
[12]张玺华,罗文军,文龙,等.四川盆地寒武纪龙王庙组沉积相演化及石油地质意义[J].断块油气田,2018,25(4):419-425.
[13]李双建,周雁,高波,等.大巴山山前带油气成藏条件与勘探方向[J].天然气工业,2012,32(6):9-14.
[14]贾锦生,宋华颖,伊海生,等.米仓山—大巴山前缘古生界重点剖面烃源岩特征研究[J].天然气地球科学,2011,22(6):1046-1053.
[15]杨跃明,文龙,罗冰,等.四川盆地达州—开江古隆起沉积构造演化及油气成藏条件分析[J].天然气工业,2016,36(8):1-10.