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塔河油田九区奥陶系勘探开发具有一定的勘探开发潜力,岩溶作用是该区奥陶系储层形成的主要机制。本文通过钻井奥陶系岩心、薄片观察及地化资料的分析研究,认为同生期大气水溶蚀作用遵循三级层序高位体系域高频层序界面控制模式;海西早期岩溶遵循大气水沿断裂渗入流动岩溶模式,断裂是主控因素;海西晚期热液溶蚀也与断裂密切相关。区内奥陶系储层主要为岩溶洞穴型及孔洞缝型储层,且为受多期溶蚀或岩溶作用的改造而形成;其中加里东中期与海西早期岩溶作用叠加改造形成岩溶孔洞缝型储层和岩溶洞穴型储层,海西晚期热液溶蚀作用对岩溶缝洞型储层具有一定程度改造。该认识对于研究区内奥陶系储层的评价和后续开发部署具有重要意义。
The exploration and development of Ordovician in the 9th District of Tahe Oilfield have certain exploration and development potentials. Karstification is the main mechanism for the formation of Ordovician reservoirs in this area. Based on the analysis of the Ordovician cores, thin slices and geochemical data, we conclude that the atmospheric water erosion during the same period follows the high-frequency sequence boundary-controlled model of the third-order highstand system tract. In the early Hercynian, Fractures infiltrated into the flowing karst mode and faults were the main controlling factors. Late Hercynian hydrothermal dissolution was also closely related to faults. The Ordovician reservoirs in the area are mainly karst caverns and pore seam reservoirs, and are formed by the alteration of multi-stage dissolution or karstification. In the middle Caledonian and Early Hercynian karstification, superposition and alteration resulted in the formation of karst caverns Reservoirs and karst cavern reservoirs. Late Hercynian hydrothermal dissolution had a certain degree of alteration to karst fracture-cave reservoirs. This understanding is of great significance for the evaluation of the Ordovician reservoir in the study area and the subsequent development and deployment.