海西早期岩溶改造作用及古地貌恢复-以塔河2区为例

塔河油田2区奥陶系储层为一间房组碳酸盐岩礁滩相地层,结合储层岩芯、岩石薄片、测井分析及地球化学特征,进行了构造-沉积特征研究,通过井震结合,应用填平补齐法,恢复了该区及周缘奥陶系顶面海西早期岩溶古地貌,并划分为4个亚地貌单元,分析了奥陶系储层特征及成岩作用,研究了储层岩溶作用期次,得出海西早期的溶蚀-岩溶-构造破裂是储层改造的主要作用机制；通过现今钻井缝洞单元分布,结合海西早期岩溶古地貌、古水系及断裂控制,提出储层发育的有利区带,得出环T443、TK220、T207井附近泄水洼凼北部区域是岩溶储层发育最有利区域。

Early Hercynian karst reconstruction and Ancient landform Recovery -Two in Tahe oilfield as an example

The area of Tahe oil field two of The Ordovician reservoir in Yijianfang Formation carbonate reef flat facies strata, and combined with reservoir cores, rock thin section, logging analysis and geochemical characteristics, studied characteristics of tectonic and sedimentary, through combination of well and seismic, application and fill in the Qi method, recovery in the region and around the top surface of Early Hercynian karst palaeogeomorphology, and divided into 4 sub geomorphic unit, analyzes the reservoir characteristics and diagenesis of the Ordovician reservoir, karst stages, the Early Hercynian karst and karst tectonic fracture is the main mechanism of reservoir reconstruction; through the current drilling fracture cave unit distribution, combined with Early Hercynian karst palaeogeomorphology, ancient water system and fracture control, the favorable area for Reservoir Development Zone, the ring T443, TK220, T207 well near discharge wa Dang northern region is the most favorable area of karst reservoir.