克拉玛依油田530区P_2w^1砾岩油藏储层随机模拟

STOCHASTIC SIMULATION OF P_2w^1 CONGLOMERATE OIL RESERVOIRS IN BLOCK 530 OF KARAMAY OILFIELD

根据克拉玛依油田 5 30区P2 w1砾岩油藏的特点 ,采用二步建模法 ,即运用地震相、测井相、试井相及岩芯分析等资料建立储层沉积模式的序贯指示模拟法和既考虑沉积历史也考虑沉积机制 ,以得到储层有关属性参数空间分布的半马尔可夫模拟法 ,分别模拟了研究区沉积相和储层物性特征参数。从采用序贯指示模拟法建立的油藏沉积相静态模型可以看出 ,古水流自左上方进入沉积区 ,在断裂下降盘沉积了扇中、扇缘亚相 ,缺失扇顶亚相 ,XW3 沉积不连续 ,XW2 沉积变缓且更均匀。从采用半马尔可夫模拟技术建立的储层特征参数静态模型上可以看出 ,XW3 沉积厚度大、变化频繁 ,XW2 沉积厚度小 ,规律性更分明 ,XW3 孔隙度、渗透率值变化均大于XW2 ,而含油饱和度恰好相反。模拟预测认为 ,靠近克乌断裂带西段附近物性参数好于其他部位 ,是油气有利储集区 ,应为首选区。由于静态模型准确表达了油藏空间分布规律 ,因此减少布井 16口 ,节约进尺 4 2 7× 10 4m。

Two -Step Stochastic Simulation is employed on the basis of the characteristics of P 2w1 conglomerate oil reservoir in block 530 of Karamay oilfield namely; seismic phase, logging phase , well testing phase as well as data collected from analysis of the rock cores etc. are used in setting up a succession indicator simulating reservoir sedimentary model and the semi-Markov simulating space \{distribution\} of reservoir property parameter either in \{consideration\} of sedimentary history or in consideration of sedimentary mechanism to simulate respectively sediments in the study area and characteristic parameters of reservoir physical property. It can be obviously observed from the static model of reservoir sedimentary facies established by setting up a succession indicator simulating reservoir sedimentary model that ancient waterflow entering sedimentary area from upper left part, and where subfacies of middle part of the fan and edge of the fan in the downdip block of the fracture deposit and subfaices of the fan top is absent, XW 3 \{sediments\} are uncontinuously and XW 2 sediments become gentle and even. It can be seen very clearly from reservoir characteristic parameters of the static model set up by the semi-Markov simulating technique that the thickness of XW 3 sediments is great and change frequently, the thickness of XW 2 sediments is small and with a distinct regularity. Variation value of XW 3 porosity and permeability is greater than that of XW 2 but saturation of oil content is on the \{contrary.\} It is believed by simulating predication that parameters of the reservoir physical property near the west section of Ke-Wu fracture zone is better than that of other sections, and which is a favorable oil and gas reservoir region where first priority for prospecting should be given.16 wells have been cancelled from well pattern(saved drilling footage 4.27×104 m) because of the reservoir space distribution regularity accurately expressed by the static model of the reservoir.