Abstract
Abstract In district 4 of the Tahe Oilfield, the Ordovician Yingshan Formation was most petroliferous. Marine carbonate rocks with big thickness were widespread. Secondary pores, including dissolution pores, fractures and caves, served as the main reservoir spaces, while primary pores were poorly developed. According to modern karst hydraulic unit theory, a conceptual model of karst was established. Three palaeo-hydraulic zones were identified:vadose zone (including infiltration sub-zone and percolation sub-zone), phreatic zone and tranquil zone. The distribution of reservoirs was described using stochastic seismic inversion technology. The reservoirs were controlled by palaeo-hydraulic zones vertically and karst landforms horizontally, which was proved by field work.
Highlights
本次反演包括地质统计分析及随机地震反演 两部分,采用真三维全局反演方式处理。 首先开 展了变差函数分析,采用多元回归的方法统计井 点处阻抗属性特征值,建立其分布直方图和变差 关系,通过地质统计拟合出函数曲线。 在此基础 上,以常规 波阻抗反演作为井间约束条件, 应 用 拟合函数开展随机模拟反演,得到一系列等概率 的高分辨率波阻抗数据体。 结合井点岩溶分带 划分成 果及储层解释成果, 并结合油井生产动态,选择一 套符合程度最佳的数据, 得到最终反 演成果(图 3)。 根据速度分析成果,储层波阻抗 为相对低值,非储层为高值的特点。 从剖面上可 以看出,储层纵向分带特征明显, 储层主要发育 于风化壳附近,远离风化壳,储层发育变差,剖面 上的充填溶洞特征明显,储层在空间上的展布规 律与岩溶概念模型吻合。
The reservoirs were controlled by palaeo⁃hydraulic zones vertically and karst landforms horizontally, which was proved by field work
Characteristics and evaluation of fracture - pore reservoir of Ordovician Yingshan Formation in Bachu-Maigaiti region,Tarim Basin[ J] .Petroleum Geology & Experiment,2011,33(2) :124-129
Summary
本次反演包括地质统计分析及随机地震反演 两部分,采用真三维全局反演方式处理。 首先开 展了变差函数分析,采用多元回归的方法统计井 点处阻抗属性特征值,建立其分布直方图和变差 关系,通过地质统计拟合出函数曲线。 在此基础 上,以常规 波阻抗反演作为井间约束条件, 应 用 拟合函数开展随机模拟反演,得到一系列等概率 的高分辨率波阻抗数据体。 结合井点岩溶分带 划分成 果及储层解释成果, 并结合油井生产动态,选择一 套符合程度最佳的数据, 得到最终反 演成果(图 3)。 根据速度分析成果,储层波阻抗 为相对低值,非储层为高值的特点。 从剖面上可 以看出,储层纵向分带特征明显, 储层主要发育 于风化壳附近,远离风化壳,储层发育变差,剖面 上的充填溶洞特征明显,储层在空间上的展布规 律与岩溶概念模型吻合。. Vertical zoning of karst formations in reservoirs with thick limestones: A case study of district 4 in Tahe Oilfield Abstract: In district 4 of the Tahe Oilfield, the Ordovician Yingshan Formation was most petroliferous. 图 1 塔河油田四区奥陶系顶面古地貌 Fig.1 Paleo⁃geomorphology of Ordovician top in district 4, Tahe Oilfield
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