鄂尔多斯古隆起周边奥陶系古岩溶地貌特征

Landform Feature of Paleo-uplift Peripheral Ordovician Palaeokarst in Erdos Basin

为了搞清鄂尔多斯盆地古隆起周边的古岩溶地貌对储层的影响,根据古隆起周边的地质背景,探讨了稳定的克拉通盆地浅海环境下形成碳酸盐岩构造。不整合面大致代表了古岩溶地貌形态。按照成岩阶段和成岩环境把鄂尔多斯盆地古岩溶划分为同生期岩溶,表生期岩溶,埋藏期岩溶三种类型。运用"残余厚度法"及"印模法"恢复古地貌。将古岩溶地貌划分为岩溶台地,岩溶斜坡,岩溶残丘三个二级构造单元和高地,平台,残丘,洼地等多个三级构造单元,其发育主要受岩性、构造、成岩环境和古气候等控制。通过对古岩溶特征及古地貌的恢复进一步了解油气储存的空间和运移规律。了解古岩溶储层特征。

In order to clarify the influence of Erdos Basin paleo-uplift peripheral paleokarst landform on reservoirs, on the basis of ancient karst development geological background , the formation of carbonate rock formation under stable intracratonic basin shallow sea environment was discussed. The unconformity represents roughly paleokarst landform. According to diagenetic stages and diagenetic environment, the ancient karsts are classified into sygenetic, epigenic and burial karsts. The ancient landform has been reconstructed with residual thickness method and impression method. Ancient karst landform is mainly divided into the karst platforms, karst slopes, karst monadnock -three secondary tectonic units, and highland, platform, monadnock, etc.-many tertiary structure units; its development is mainly controlled by lithology, tectonic factors, environment and ancient climate.