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塔里木盆地下古生界白云岩是非常重要的潜在勘探领域,具有厚度大、范围广、资源量巨大的特征,同时又具有时代老、埋藏深、成岩作用复杂的特点,给储层的研究及勘探带来难度。通过大量的岩心、薄片及露头资料,系统地梳理了塔里木盆地下古生界白云岩的储集空间类型,组构选择性分为:晶间孔、粒间孔、粒内孔、膏模孔、溶塌角砾孔和藻格架孔;部分组构选择性分为:晶间溶孔、溶蚀孔洞;非组构选择性分为:洞穴、构造缝、溶缝和压溶缝。并展示了基于CT的晶间孔、粒间孔和粒内孔的孔喉结构特征。根据储层发育位置、分布特征,结合孔隙形成主控因素,提出了新的白云岩储层成因分类,把储层划分为受沉积相控制的、受层序界面控制的和受断裂控制的白云岩储层3个大类,并又细分为高能丘滩相、蒸发潮坪相、内幕层间岩溶、潜山岩溶、埋藏—热液岩溶和构造裂缝型白云岩储层6个小类,该分类方案具有较强的实用性。
The Lower Paleozoic dolomite in the Tarim Basin is a very important potential exploration area with large thickness, wide range and huge amount of resources. At the same time, it has the characteristics of old age, deep burial and complex diagenesis, Exploration brings difficulty. Based on a large amount of core, thin slice and outcrop data, the types of reservoir space in the Lower Paleozoic dolomite of the Tarim Basin were systematically analyzed. The structural selectivity was divided into intergranular pores, intergranular pores, intragranular pores, , Collapses brecciated pores and algae lattice pores. Some of the structures are selectively divided into intergranular dissolved pores and dissolved pores. Non-structural selectivities are divided into caves, structural joints, solution joints and pressure-dissolved joints. And shows the pore-throat structure characteristics of CT-based intergranular, intergranular and intragranular pores. According to the position and distribution of the reservoirs and the main controlling factors of pore formation, a new classification of dolomite reservoirs is proposed. The reservoirs are divided into two types of reservoirs, which are dominated by sedimentary facies, controlled by sequence boundaries and controlled by faults Rock reservoirs, and are further subdivided into six sub-categories: high-energy rhyolite, evaporite tidal flat, inter-karstified karstification, buried hill karst, burial-hydrothermal karstification and tectonic fracture dolomite reservoirs, The classification scheme has strong practicality.