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苏里格气田苏S 区块北部剩余气分布及挖潜对策
Remaining-gas distribution and its potential tapping countermeasures: An example from northern Su S block, Sulige gasfield
王 颖
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作者单位:中国石油集团长城钻探工程有限公司地质研究院
中文关键字:中二叠世 致密砂岩 非均质性 单砂体 剩余气 挖潜对策 苏里格气田
英文关键字:Middle Permian; Tight sandstone; Heterogeneity; Single sandbody; Remaining gas; Potential tapping countermeasures; Sulige gasfield.
中文摘要:    苏里格气田苏S区块北部储层致密、非均质性强、储量动用不均衡、剩余气分布复杂、低产低压井逐年增多。在精细地层对比、测井二次解释基础上,采用地震波形、储层构型及动态监测技术,建立了以单砂体为单元的地质模型和数值模型,明确了当前地层压力、含气饱和度及储量丰度分布特征,总结剩余气分布模式,提出了调层、侧钻等挖潜对策。结果表明:①苏S 区块北部砂体展布方式以叠加型和切割型为主,储层宽厚比介于50 ~ 200,垂直河道储层发育规模有限,沿河道方向连续性好,平面上以中二叠统下石盒子组8 段4、5 小层砂体最为发育,主要集中在中间区域,东西两侧下二叠统山西组1 段气层发育;②剩余储量主要分布在东、西两侧的山17、山18小层和中间局部区域的盒84 —盒86 小层;③剩余气分布模式有井网未控制型、层内非均质型和层间非均质型3 种,其中井网未控制型和层内非均质型是井间加密侧钻水平井和侧钻井的主要潜力区,层间非均质型是老井调层的重点目标。挖潜对策的现场试验,效果突出,结论认为剩余气预测精度由63.5% 提高到93.8%。
英文摘要:    In northern Su S block, Sulige gasfield, most reservoirs are characterized by tight lithology, strong heterogeneity, no equilibrium of reserves put to use, complex remaining-gas distribution, and increased gas wells occurring with low production and pressure. So, based on fine stratigraphic correlation and logging reinterpretation, one geological model and another numerical model with a single sandbody unit were established by using seismic waveform, reservoir configuration, and dynamic monitoring techniques. Then, current formation-pressure distribution characteristics, gas saturation, and reserve abundance were made certain. Finally, remaining- gas distribution pattern was summarized, and some potential tapping countermeasures were made, such as layer adjustment and sidetracking. Results show that, (1) in northern Su S block, the sandbody is mainly superimposed and cut, and reservoir width/thickness ratio ranges from 50 to 200. The development scale of vertical channel reservoirs is limited, and the continuity along river channel is good. On the plane, the P2x8 4-5 sandbodies are the most developed and mainly found in the middle. The Shanxi 1 gas reservoirs (P1s1) are developed on the eastern and western; (2) the remaining reserves are mainly distributed in P1s 1 7-8 on the eastern and western and in P2x8 4-6 in the central; and (3) the remaining-gas distribution pattern can be divided into three types, i.e., well pattern uncontrolled type, intralayer heterogeneous type, and interlayer heterogeneous type. Among them, the first two ones are the main potential regions to deploy interwell infill sidetracking horizontal and sidetracking wells, and the last one is the key target of layer adjustment in d wells. Application of these potential tapping countermeasures are remarkable. In conclusion, an accuracy to predict the remaining gas is improved from 63.5% to 93.8%.
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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
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