川西坳陷须家河组古圈闭类型及识别技术
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摘要
上三叠统是川西坳陷的主力烃源岩,其中须家河组二段、四段是主要储层。上三叠统烃源岩的生、排烃高峰在晚三叠世和中—晚侏罗世,其生、排烃高峰早,成藏早。储层孔隙演化史表明,燕山期末的致密化“冻结”了早期圈闭的油气,喜山期构造运动的叠加改造,使得古圈闭向复杂、隐蔽圈闭转化。对已知气藏和勘探区的解剖分析表明,该区有5种古圈闭类型:即古构造-成岩圈闭、古构造-岩性圈闭、古构造圈闭、古今叠合构造圈闭和地层岩性圈闭。勘探实践证实,印支晚期—燕山期的古圈闭是有效圈闭。利用构造演化分析,结合地震、测井等识别技术寻找古圈闭,是川西须家河组致密储层气藏切实有效的勘探途径。
The upper Triassic formation is the primary hydrocarbon source rock of the western Sichuan Depression.The second section and forth section of Xujiahe Formation are the main reservoirs.The peaks of hydrocarbon generation and expulsion of the upper Triassic formation appeared in the Late Triassic and Middle-Late Jurassic periods.The early hydrocarbon generation and expulsion led to form oil-gas reservoir early.The reservoir evolvement shows that tightening completed at the end of Yanshanian froze up oil and gas of palaeo-trap.The multi-episodic superimposition of the tectonic movement modified the palaeo-trap and made it complicated and subtle.The analysis on known gas reservoirs and exploration areas shows that there are five types of palaeo-trap including palaeostructural-diagenetic trap,palaeostructural-lithologic trap,palaeostructural trap,superposed structural trap and stratigraphic-lithologic trap.The exploration and research results proved that the Late Indosinian and Yanshanian traps are available.Seeking for palaeo-trap by structure evolvement combining seismic-logging technique is a practical way for gas exploration in the tight reservoir of Xujiahe Formation in the western Sichuan Depression.
The upper Triassic formation is the primary hydrocarbon source rock of the western Sichuan Depression.The second section and forth section of Xujiahe Formation are the main reservoirs.The peaks of hydrocarbon generation and expulsion of the upper Triassic formation appeared in the Late Triassic and Middle-Late Jurassic periods.The early hydrocarbon generation and expulsion led to form oil-gas reservoir early.The reservoir evolvement shows that tightening completed at the end of Yanshanian froze up oil and gas of palaeo-trap.The multi-episodic superimposition of the tectonic movement modified the palaeo-trap and made it complicated and subtle.The analysis on known gas reservoirs and exploration areas shows that there are five types of palaeo-trap including palaeostructural-diagenetic trap,palaeostructural-lithologic trap,palaeostructural trap,superposed structural trap and stratigraphic-lithologic trap.The exploration and research results proved that the Late Indosinian and Yanshanian traps are available.Seeking for palaeo-trap by structure evolvement combining seismic-logging technique is a practical way for gas exploration in the tight reservoir of Xujiahe Formation in the western Sichuan Depression.
引文
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①叶军,吕正祥,甘其刚,等.川西坳陷上三叠统须家河组天然气富集规律及其预测技术研究.中国石化西南分公司勘探开发研究院,2003.
①叶军,吕正祥,甘其刚,等.川西坳陷上三叠统须家河组天然气富集规律及其预测技术研究.中国石化西南分公司勘探开发研究院,2003.
[2]杨克明,徐进.川西坳陷致密碎屑岩领域天然气成藏理论与勘探开发方法技术[M].北京:地质出版社,2004:98-104.
[3]曹烈,安凤山,王信.川西坳陷须家河组气藏与古构造关系研究[J].石油与天然气地质,2005,26(4):224-229.
[4]岳东明,王信.浅析川西坳陷燕山中、晚期构造圈闭的有效性[J].石油实验地质,1999,21(2):128-131.
[5]李宗银,李耀华,王翎入.川中—川西地区上三叠统天然气成藏主控因素[J].天然气勘探与开发,2005,28(1):5-7.
[6]安凤山,王信,叶军.对中坝须二气藏圈闭分析的思考[J].天然气工业,2003,23(4):8-12.
[7]尹长河,王廷栋,郑丽辉.平落坝气田成藏时期的确定[J].天然气地球科学,1999,10(3/4):70-75.
[8]张振生,黎英,王冰.冀中坳陷陆相地层层序地层学的应用[J].石油学报,1997,18(2):26-34.
[9]张子枢,黄开敬,刘成根.国外古圈闭油气藏调研及勘探方法[J].天然气勘探与开发,1995,18(4):1-34.
[10]蔡希源,辛仁臣.松辽坳陷深水湖盆层序构成模式对岩性圈闭分布的控制[J].石油学报,2004,25(5):6-10.
[11]邹才能,李明,赵文智,等.松辽南部构造—岩性油气藏识别技术及应用[J].石油学报,2004,25(3):21-43.
①叶军,吕正祥,甘其刚,等.川西坳陷上三叠统须家河组天然气富集规律及其预测技术研究.中国石化西南分公司勘探开发研究院,2003.
①叶军,吕正祥,甘其刚,等.川西坳陷上三叠统须家河组天然气富集规律及其预测技术研究.中国石化西南分公司勘探开发研究院,2003.
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