贵州黄平凹陷下古生界油气勘探潜力
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摘要
黄平凹陷上震旦统—三叠系为碳酸盐岩与碎屑岩交互沉积,厚度达5000～6000m,曾具有较好的油气成藏过程。主要有三套烃源岩,即震旦系陡山沱组黑色碳质泥页岩,为"好"烃源岩;下寒武统九门冲组炭质泥页岩和灰岩,以及下寒武统变马冲组—耙榔组泥页岩、炭质泥岩,均为"较好"烃源岩。含油气层主要为下寒武统九门冲组石灰岩、变马冲组—耙榔组砂岩、志留系翁项群二段砂岩和三段泥岩中的砂岩夹层。盖层分布广,厚度大,封盖性好。生储盖组合重复出现,油源、构造的配置关系很好,具有较好的油气保存条件。近期的浅层地震资料表明,虎庄背斜和鱼洞向斜分别可是寻找深层天然气和浅层油气的远景构造。
There are 5000～6000m thickness of alternated Upper Sinian-Triassic carbonate rock and clastic rock in Huangping Sag, in which a large scale of hydrocarbon migration and accumulation took place during historical periods and abundant hydrocarbon resources can be supplied for Central Guizhou Uplift and its adjacent areas. Based on the comprehensive analysis and study on geologic structures, strata and it's hydrocarbon-bearing property, hydrocarbon accumulation conditions, geophisics and drilling data, there are three sets of main source rocks, which are Sinian Doushantuo black carbonaceous shale (belongs to "good"source rock), Lower Cambrian Jiumenchong carbonaceous shale and limestone, and Lower Cambrian Bianmachong-Balang shale and mudstone(belong to "relatively good"). The hydrocarbon-bearing reservoirs are Lower Cambrian Jiumenchong limestone and Bianmachong-Balong sandstone, and mainly Silurian Wengxiang sandstone interlayers near the Silurian/Lower Ordovician unconformity. There are several Paleozoic caps, some of which are thick and wide-distributed. Hydrocarbon source is well matched with traps. The shallow seismic data available recently have further proved that some prospecting structural traps, such as Huzhuang anticline and Yudong syncline, exist in this area.
There are 5000～6000m thickness of alternated Upper Sinian-Triassic carbonate rock and clastic rock in Huangping Sag, in which a large scale of hydrocarbon migration and accumulation took place during historical periods and abundant hydrocarbon resources can be supplied for Central Guizhou Uplift and its adjacent areas. Based on the comprehensive analysis and study on geologic structures, strata and it's hydrocarbon-bearing property, hydrocarbon accumulation conditions, geophisics and drilling data, there are three sets of main source rocks, which are Sinian Doushantuo black carbonaceous shale (belongs to "good"source rock), Lower Cambrian Jiumenchong carbonaceous shale and limestone, and Lower Cambrian Bianmachong-Balang shale and mudstone(belong to "relatively good"). The hydrocarbon-bearing reservoirs are Lower Cambrian Jiumenchong limestone and Bianmachong-Balong sandstone, and mainly Silurian Wengxiang sandstone interlayers near the Silurian/Lower Ordovician unconformity. There are several Paleozoic caps, some of which are thick and wide-distributed. Hydrocarbon source is well matched with traps. The shallow seismic data available recently have further proved that some prospecting structural traps, such as Huzhuang anticline and Yudong syncline, exist in this area.
引文
①杨传中.黄平凹陷油气保存条件分析.贵州石油科研所,1990.
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[2]何丰胜,杜定权.凯里虎庄背斜的构造特征及油气保存条件分析[J].贵州工业大学学报,2001(1):20-23.
[3]余开富,王守德.贵州南部的都匀运动及其古构造特征和石油地质意义[J].贵州地质,1995(3):225-232.
[1]胡惟元,袁洪.黔东下古生界区域盖层与找气前景[J].贵州地质,1995(1):56-60.
[2]何丰胜,杜定权.凯里虎庄背斜的构造特征及油气保存条件分析[J].贵州工业大学学报,2001(1):20-23.
[3]余开富,王守德.贵州南部的都匀运动及其古构造特征和石油地质意义[J].贵州地质,1995(3):225-232.
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