摘要:
哈拉哈塘地区自北往南可分为潜山岩溶区、层间岩溶顺层改造区、层间岩溶台缘叠加区、层间岩溶斜坡区。层间岩溶-顺层改造区为潜山岩溶区和层间岩溶区过渡区域,文章对前志留纪和良里塔格组岩溶期沉积间断古岩溶水文条件特征进行了详细分析,认为地表河流特征总体表现为自北往南径流,深切河谷决定着局部排泄基准面的深度。在此基础上对地下暗河特征进行刻画,本区地下暗河类型多样,总体表现为流入型和流出型暗河管道系统发育,多为单流入、流出系统,地震反射暗河特征较明显,多为连续或断续串珠强反射,以良里塔格组岩溶期暗河最为发育,且前志留纪岩溶期“断头河”多为部分伏流出口。地下暗河管道附近往往发育大型缝洞体,是目前勘探开发重点研究攻坚对象,因此精确恢复和刻画古岩溶流域水文系统的分布特征,寻找油气藏有利储层是广大岩溶油藏专家所关注的重点。
Abstract:
From north to south,the Halahatang area of northern Tarim can be divided buried hill in karst, interbed karst bedding reform,interbed karst platform-margin overlap,and karst slope zones.Among these,the inter-bed karst-bedding reform zone is the transition area between the buried hill karst and bedding karst zones.This paper presents a detailed analysis on the ancient karst hydrological conditions for sediment discontinuity in the Pre-Silurian and Lianglitage formation karst period.The results suggest that the surface drainages are characterized overall by runoff from north to south and deeply incised valleys that decided the depth of the local discharge datum.There are various kinds of underground rivers,which are of flow in and flow out types as pipeline systems,mostly in single inflows and outflows.On seismic reflection profiles, these rivers can be recognized by continuous or intermittent beaded strong reflections,of which the karst subsurface river of the Lianglitage formation is particularly obvious.Most of beheaded rivers of the Pre-Silu-rian have hidden outlets.In the vicinity of these underground rivers,there exist big fissure-cavity bodies which are the important targets in current exploration.Thus accurate reconstruction and description of the hydrology of these ancient karst drainages would be help to search for favorable reservoirs of hydrocarbon.
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