黄骅坳陷奥陶系古岩溶发育演化模式

黄骅坳陷奥陶系古岩溶经历了3个演化阶段，具有7种发育模式。第一阶段为加里东晚期——海西早期，发育向斜翼部侵蚀洼地排泄型和向斜轴部山间洼地排泄型古岩溶；第二阶段为印支期——燕山早期，发育溶丘洼地裸露型和断陷盆地浅埋藏型古岩溶；第三阶段为燕山晚期——喜马拉雅期，发育倾斜垒武断块压释水岩溶、深埋褶断凸起压释水岩溶和深大断裂带高位掀斜断块热水岩溶。3期古岩溶均强烈发育的叠合区为最有利储集层的发育区，环板桥凹陷潜山构造带为下步重点勘探的最有利目标区之一。图4参11

The developed and evaluated patterns of Ordo-vician palaeo-karst in the Huanghua Depression

The Ordovician palaeo-karst had gone through 3 evolution stages and there are 7 types of developed patterns in the Huanghua Depression. The first stage was from Late Caledonides to Early Hercynian Period, and two exposed palaeo-karst types of erosion depression discharge in syncline wings and intermountain depression discharge in syncline axle developed. The second stage was from Indochina to early Yanshan Period, and divided into exposed palaeo-karst in karst dome-depression and shallow buried palaeo-karst in down-faulted basin. The third stage was from Late Yanshan to Himalayan Period, and there were three types of compaction-released water karst at inclined fortress block areas and deeply buried faulted convex areas and hot water karst at high level inclined block in big faulted zones. The strongly karstification overlapping areas of three periods are most favorable for oil and gas accumulation.