印度东部盆地群地质特征、油气成藏与深水区勘探潜力
发布时间:2018-03-01 04:28
本文关键词: 被动大陆边缘 深水油气勘探 深水扇 三角洲 默哈讷迪盆地 克里希那—戈达瓦里盆地 高韦里盆地 印度东部 出处:《石油勘探与开发》2017年05期 论文类型:期刊论文
【摘要】:基于印度东部盆地群区域构造沉积演化、地层充填和油气地质特征,建立深水扇体发育和成藏模式,分析深水区勘探潜力。印度东部被动大陆边缘形成源自东冈瓦纳古大陆裂解,经历了克拉通内裂谷(P_1—T)、东冈瓦纳裂谷(J_1—K_1)、裂后热沉降(K_2)和被动大陆边缘(K_3—N)4个演化阶段,发育裂后热沉降期末、被动大陆边缘I期末和Ⅱ期末3个明显不整合,形成裂谷期和被动大陆边缘Ⅰ期、Ⅱ期、Ⅲ期4套构造层,被动大陆边缘阶段沉积是盆地群地层主体,形成近岸叠覆型扇复合体、与三角洲有关的断裂坡折部位低位扇和前缘浊积扇两类富油气沉积体系。盆地内发育下二叠统、下白垩统、上白垩统和古近系4套证实的烃源岩,平面分布差异大;发育裂谷期砂岩和碳酸盐岩、裂后热沉降和被动大陆边缘时期三角洲和深水重力流砂岩等多种类型储集层,总体为中孔、低渗条件;油气盖层多、厚度变化大,漂移期多为区域封盖,其他时期则以局部封盖为主;形成上白垩统砂岩、古近系砂岩、新近系砂岩等8个成藏组合。被动大陆边缘阶段深水区油气勘探在平面上应以克里希那和高韦里河流三角洲地区为主,纵向上则以被动大陆边缘阶段与构造相关三角洲砂体、断裂坡折处低位扇、85°E海脊附近和高韦里盆地南部海域近岸扇复合体为重点。
[Abstract]:Based on the regional tectonic and sedimentary evolution, stratigraphic filling and oil and gas geological characteristics of the basin group in eastern India, a deep-water fan development and reservoir formation model is established. The formation of the passive continental margin in eastern India originated from the cracking of the East Gangwanar continent, which has undergone four stages of evolution: P1-T, J1-K1C, post-thermal subsidence K2) and K3-N) in the inner craton rift, the East Gondwana Rift (J1-K1) and the passive continental margin (K3-N). At the end of thermal subsidence, there are three obvious unconformities in the late stage of passive continental margin, I and II, forming four sets of tectonic layers in rift period and passive continental margin stage 鈪,
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