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加里东期风化壳发育的程度直接影响了相关储层的发育 ,而古地貌对次生孔隙的发育起决定作用。针对加里东期古风化面的重要性 ,文中把古地貌分为岩溶高地、岩溶斜坡和岩溶洼地 3个古地貌单元 ,并分析了原有古地貌恢复方法 (残余厚度法、标准法等 )存在的 4个缺点 ,在此基础上提出了以具有等时性的区域性不整合面为核心内容的层序地层学恢复古地貌方法。作者应用该方法对济阳坳陷沾化地区加里东期古地貌进行了恢复 ,并分析了该地区处于岩溶高地的 991潜山和处于岩溶洼地的孤岛潜山两个不同古地貌单元的岩溶发育特征。结果表明 ,层序地层学方法能准确地恢复加里东期古地貌 ,进而能准确地预测次生孔隙发育带 ,并最终指导与岩溶有关的油气勘探。
The degree of development of the weathering crust in Caledonian directly affected the development of related reservoirs, while the palaeogeomorphology played a decisive role in the development of secondary pores. According to the importance of the paleo-paleo-paleo-paleo-paleo-paleo-paleo-paleo-paleo-paleo-paleo-paleo-paleo-paleozoic surface in Caledonian, the paleogeomorphology is divided into three paleogeomorphic units such as karst highlands, karst slopes and karst depressions. Based on this, a new method for the restoration of paleogeomorphology based on sequence stratigraphy with regional unconformity with isochronous as the core content is put forward. The authors applied this method to recover the paleogeomorphology of the Caledonian period in Zhanhua area in the Jiyang Depression and analyzed the karst development of two different palaeogeomorphic units in the 991 buried hill in the karst highlands and the isolated island hill in the karst depressions feature. The results show that the sequence stratigraphy method can accurately recover the paleogeomorphology of the Caledonian period, and then predict the secondary pore development zone accurately and finally guide the exploration of karst-related oil and gas.