渤海锦州25-1S混合花岗岩潜山大油气田的发现
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摘要
锦州25-1S构造位于渤海辽东湾,该构造周围曾钻过7口预探井均没有商业性油气发现。通过对已钻井及潜山成藏条件的再认识,对潜山基岩岩性及地震反射特征、混合花岗岩储层物性以及油气运移成藏条件的深入分析,认识到邻近富生烃凹陷的基岩隆起、区域性盖层之下的好储层是形成潜山油藏的必要条件;混合花岗岩基岩与密集的断层耦合控制了潜山储层物性,坡上山高度小于风化-淋滤带厚度利于油气运移。锦州25-1S构造成藏条件优于已钻的7个圈闭,具备形成大—中型油气藏的条件。在新认识指导下钻探锦州25-1S,发现了目前国内最大的混合花岗岩潜山油气藏,并且锦州25-1S为复合油气田,地质储量超过9 000×104m3油气当量。
The structure Jinzhou 25-1S is located in Liaodong bay,Bohai sea,on which seven preliminary exploratory wells were drilled before 2000,resulting in no commercial discovery.By revaluating the drilled wells and the buried-hill hydrocarbon accumulation conditions and deeply analyzing lithology and seismic reflections of buried-hill bedrocks and petrophysical properties and hydrocarbon migration-accumulation conditions of migmatitic granite reservoirs,it is identified that good reservoirs on bedrock domes adjacent to hydrocarbon kitchens and under regional seals are necessary to forming buried-hill oil accumulations.The petrophysical properties of buried-hill reservoirs are controlled by a combination of migmatitic granite bedrocks with dense faulting,and hills on a slope would be favorable to petroleum migration if their heights are lower than the weathering-leaching zone thickness.The structure Jinzhou 25-1S is better in hydrocarbon accumulation conditions than the seven prospects drilled,and it is possible to form large and major types of hydrocarbon accumulations.Through drilling under a direction from the new concepts,the largest buried-hill hydrocarbon accumulations of migmatitic granite are discovered on the structure,and as a complex oil and gas field,its geologic reserves are over 90 million m3 oil equivalent.
The structure Jinzhou 25-1S is located in Liaodong bay,Bohai sea,on which seven preliminary exploratory wells were drilled before 2000,resulting in no commercial discovery.By revaluating the drilled wells and the buried-hill hydrocarbon accumulation conditions and deeply analyzing lithology and seismic reflections of buried-hill bedrocks and petrophysical properties and hydrocarbon migration-accumulation conditions of migmatitic granite reservoirs,it is identified that good reservoirs on bedrock domes adjacent to hydrocarbon kitchens and under regional seals are necessary to forming buried-hill oil accumulations.The petrophysical properties of buried-hill reservoirs are controlled by a combination of migmatitic granite bedrocks with dense faulting,and hills on a slope would be favorable to petroleum migration if their heights are lower than the weathering-leaching zone thickness.The structure Jinzhou 25-1S is better in hydrocarbon accumulation conditions than the seven prospects drilled,and it is possible to form large and major types of hydrocarbon accumulations.Through drilling under a direction from the new concepts,the largest buried-hill hydrocarbon accumulations of migmatitic granite are discovered on the structure,and as a complex oil and gas field,its geologic reserves are over 90 million m3 oil equivalent.
引文
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[4]童崇光.中国东部裂后盆地石油地质特征[J].石油学报,1980,1(4):19-26.
[5]葛许芳,唐瑾,吴郁,等.冀中坳陷河间南潜山油藏勘探技术[J].石油勘探与开发,2003,30(1):54-56.
[6]郭建华,刘辰生,吴东胜,等.大民屯凹陷静安堡西侧低潜山油气成藏条件分析[J].中南大学学报:自然科学版,2005,36(2):329-334.
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