塔西南坳陷奥陶纪构造活动与油气成藏

发布时间：2018-06-25 18:02

本文选题：塔西南坳陷 + 奥陶系　；参考：《石油地球物理勘探》2017年04期

【摘要】：塔西南坳陷奥陶纪构造活动与油气成藏关系密切。开展了近15×10~4km~2的地震资料构造解析,恢复了不同时期奥陶系鹰山组顶面构造形态,厘清了奥陶系顶面构造高点迁移特征,明确了奥陶纪构造活动与油气成藏的关系。研究认为,塔西南坳陷奥陶系顶面历经北倾向南倾和东倾向西倾的"跷跷板"式改造过程,发育调整迁移型古隆起,不利于油气的富集保存,构造活动的枢纽带是次生油气聚集带;其次,构造活动在奥陶系形成不同期次的断背斜圈闭,其中晚海西期和晚喜马拉雅期定型圈闭内发现油气,断裂是油气垂向运移的通道;第三,奥陶系鹰山组上段风化壳储层主要分布在断裂带,鹰山组下段内幕白云岩储层则分布较广,在靠近直立的走滑断裂附近最为发育,地震剖面上表现为"串珠"状反射;第四,奥陶系油气发现主要分布在南北向和东西向构造调整的枢纽带内,其中坳陷中段的东西向构造活动枢纽带是下一步油气勘探的有利区带,近期罗斯2井获得高产工业气流。
[Abstract]:The Ordovician tectonic activity in southwest Tarim depression is closely related to oil and gas accumulation. The structural analysis of nearly 15 脳 10~4km~2 seismic data has been carried out, and the structural morphology of the top surface of the Yingshan formation of the Ordovician has been restored in different periods, the characteristics of the high point migration of the top surface of the Ordovician have been clarified, and the relationship between the tectonic activity of the Ordovician and the hydrocarbon accumulation has been clarified. It is considered that the top surface of Ordovician system in the southwest depression of the Tarim Basin has undergone a seesaw transformation process of north to south and east to west, which is not conducive to the accumulation and preservation of oil and gas. The secondary hydrocarbon accumulation zone is the pivot zone of tectonic activity, secondly, tectonic activity forms faulted diagonal traps in different stages of the Ordovician, in which oil and gas are found in late Hercynian and late Himalayan traps, and faults are channels for vertical migration of oil and gas. Third, the weathering crust reservoir of the upper member of Yingshan formation of Ordovician is mainly distributed in the fault zone, and the inside dolomite reservoir of the lower member of Yingshan formation is widely distributed, which is the most developed near the vertical strike-slip fault, and the seismic profile is characterized by "beaded" reflection. Fourthly, the discovery of Ordovician oil and gas is mainly distributed in the pivot belt of the structural adjustment in the north-south and the east-west direction, in which the EW-trending tectonic active hub zone in the middle part of the depression is the favorable zone for the next step of oil and gas exploration. A high-yield industrial airflow was recently obtained in well Ross 2.
【作者单位】：中国石油勘探开发研究院西北分院;
【基金】：中国石油天然气股份有限公司重大科技专项(041012120005)资助
【分类号】：P534.42;P618.13

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