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塔河油田T738井区位于上奥陶统浅覆盖区,发育大型岩溶缝洞型储层。基于三维地震资料、岩心资料、成像测井资料、钻井资料,并结合地震属性提取技术,对该区储层的沉积特征和岩溶特征进行了研究,探讨了储层发育的主要岩溶阶段及主控因素,并建立了岩溶发育模式。结果表明:岩溶储层主要发育在一间房组和鹰山组上部,储集空间主要有溶蚀孔洞、裂缝和大型洞穴,具有层状分布特征;加里东Ⅰ幕形成的溶蚀孔洞和裂缝以及颗粒灰岩中保留的原生孔隙整体规模较小;在岩溶水补给条件充足、先期裂缝和溶蚀孔洞提供优势运移路径以及以深切沟谷和断裂为排泄通道的水文地质背景下,形成了顺层岩溶发育模式,为下一步储层预测和勘探实践提供了理论借鉴。
Tahe Oilfield T738 well area is located in the shallow area of Upper Ordovician, the development of large-scale karst fractured reservoir. Based on the three-dimensional seismic data, core data, imaging logging data, drilling data and seismic attribute extraction techniques, the sedimentary characteristics and karst features of the reservoirs in this area are studied. The main karst phases and main control Factors, and established a karst development model. The results show that: the karst reservoirs mainly develop in the upper part of Yijianfang Formation and Yingshan Formation. The reservoir space mainly contains dissolved pores, cracks and large caves with layered distribution. The dissolution holes and fractures formed by the Caledonian Ⅰ curtain and particles The overall size of the primary pores retained in the limestone was small. Under the hydrogeological background of adequate supply of karst water, preferential fractures and dissolved pores, and the hydrogeological background of deep gullys and faults as excretory channels, formation of karst strata Model, which provides a theoretical reference for the next reservoir prediction and exploration practice.