云龙凹陷中、古生界油气保存条件研究
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摘要
云龙凹陷位于楚雄盆地东部浅坳陷区 ,中生界、古生界具备烃源岩、储集层、盖层和圈闭条件 ,但地质结构复杂 ,油气保存条件是勘探的关键问题。从该凹陷的水文地质条件、区域盖层与直接盖层条件、裂缝发育、断层活动、抬升剥蚀、岩浆活动及天然地震等方面评价 ,寒武纪—古近纪发生多阶段长期的大气水淋滤下渗作用 ,奥陶系、泥盆系和古近系剥蚀厚度巨大 ,断层和天然地震活动强烈 ,至少存在燕山期和喜马拉雅期形成的裂缝 ,对油气保存均极为不利。按照 11项保存要素进行综合评价 ,将云龙凹陷划分为中北部保存单元、西南部保存单元和东北部保存单元 ,其中 ,中北部保存单元最有利。图 3表 1参 5
The Yunlong Sag is located within the east part of Chuxiong Basin, Southwest China. The Mesozoic and Paleozoic have source rocks, reservoirs and capping conditions. However, the geological features there are real complex, so the preservation of oil and gas should be the key for the petroleum plays. The several long-term meteoric filtering stages were harmful for the oil assembling and preservation. The low salinity and Cl~ (―) concentration indicates that the formation lies in the fluid freely replacing zone, which is also a bad factor for the petroleum preservation. It was proved that the erosion thickness of Ordovician, Devonian and Paleogene were tremendous through the initial thickness recovery. The two formers greatly affect the petroleum preservation conditions. By the petroleum preservation unit criterion, Yunlong Sag was divided into 3 units: the mid-north preservation unit, the southwest preservation unit and the northeast preservation unit, in which the mid-north preservation unit was assumed to be the best one.
The Yunlong Sag is located within the east part of Chuxiong Basin, Southwest China. The Mesozoic and Paleozoic have source rocks, reservoirs and capping conditions. However, the geological features there are real complex, so the preservation of oil and gas should be the key for the petroleum plays. The several long-term meteoric filtering stages were harmful for the oil assembling and preservation. The low salinity and Cl~ (―) concentration indicates that the formation lies in the fluid freely replacing zone, which is also a bad factor for the petroleum preservation. It was proved that the erosion thickness of Ordovician, Devonian and Paleogene were tremendous through the initial thickness recovery. The two formers greatly affect the petroleum preservation conditions. By the petroleum preservation unit criterion, Yunlong Sag was divided into 3 units: the mid-north preservation unit, the southwest preservation unit and the northeast preservation unit, in which the mid-north preservation unit was assumed to be the best one.
引文
[1] 中国石化南方项目经理部.楚雄盆地北部东山—云龙地区石油地质评价与有利区带目标优选[R].北京:中国石化南方项目经理部,2000.
[2] 中国石化南方项目经理部.楚雄盆地云龙凹陷发窝构造云参1井单井评价报告[R].北京:中国石化南方项目经理部,2002.
[3] CraigH .Isotopicvatiationsinmeteoricwaters[J].Science,1961,133:17021703.
[4] 郑淑蕙,侯发高,倪葆龄.我国大气降水的氢氧稳定同位素研究[J].科学通报,1983,28(13):800806.
[5] 刘震.储层地震地层学[M].北京:地质出版社,1997.
[2] 中国石化南方项目经理部.楚雄盆地云龙凹陷发窝构造云参1井单井评价报告[R].北京:中国石化南方项目经理部,2002.
[3] CraigH .Isotopicvatiationsinmeteoricwaters[J].Science,1961,133:17021703.
[4] 郑淑蕙,侯发高,倪葆龄.我国大气降水的氢氧稳定同位素研究[J].科学通报,1983,28(13):800806.
[5] 刘震.储层地震地层学[M].北京:地质出版社,1997.
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