塔中16油藏石炭系巴楚组含砾砂岩段小层对比及地层叠置样式

摘要/Abstract

摘要： 含砾砂岩段是塔中16油藏石炭系的主力产油层段，因该套地层厚度较薄且叠置样式不明确，导致油田投入开发以来，小层划分及对比意见不统一，严重影响了油田开发方案部署以及剩余油挖潜。以剖析塔中16油藏含砾砂岩段地层叠置样式及该样式下的小层分布特征为目的，综合运用地质、测井以及新处理的三维地震资料，采用模式指导、旋回对比、动态验证、全区闭合的方法，开展了含砾砂岩段小层的划分与对比工作。研究认为：含砾砂岩段发育先超覆沉积后剥蚀的地层叠置样式；在小层的岩性特征、旋回特征以及电性特征的综合分析基础上，结合地层对比标志层，将含砾砂岩段自下而上划分为2个砂组5个小层；通过不同地层叠置样式下的地层对比方法分析，优选了适合研究区的“斜对”方式，开展全区的小层对比工作，并通过已有的生产动态资料进一步论证了划分结果的可靠性；同时，分析了1-5小层的地层平面分布范围，总体表现为由下至上地层分布范围逐渐减小的特征。

关键词: 塔中16油藏, 东河砂岩, 含砾砂岩段, 超覆, 沉积样式, 小层对比

Abstract: The pebbled sandstone section is the major oil-producing interval of Carboniferous in the Central Tarim 16 reservoir. Due to small thickness and uncertain superposition pattern, sub-layer division and correlation there cannot come to an agreement after production, which has seriously affected the development programming and remaining oil potential tapping. In order to dissect the stratum superposition pattern of the pebbled sandstone section and the sub-layer distribution characteristics thereof, sub-layer division and correlation were conducted for the interval by integrating the geology and well logging data and newly processed 3D seismic data, and using the method of model guidance, cycle contrast, dynamic verification and regional closure. The results indicate that the pebbled sandstone section has the stratum superposition pattern of denudation after overlapping deposition. On the basis of comprehensive analysis of lithologic, cyclic and electrical properties of the sub-layers, and combining the marker beds for stratum correlation, the pebbled sandstone section was divided into five sub-layers in two sand groups from lower to upper. By analyzing the stratum correlation methods for different stratum superposition patterns, the “oblique correlation” method suitable for the study area was selected for correlation of sub-layers in the study area. The reliability of the division result was further validated by the existing dynamic production data. Moreover, the plane distribution scope of all five sub-layers were analyzed. It is found that the distribution scope decreases from lower to upper.

Key words: Central Tarim 16 reservoir, Donghe sandstone, pebbled sandstone section, overlapping, sedimentary patterns, sub-layer correlation

尹楠鑫, 尹志军, 韩涛, 胡泽云, 周勇水, 李任鹏, 曹岑, 常玉丽. 塔中16油藏石炭系巴楚组含砾砂岩段小层对比及地层叠置样式[J]. 中国石油勘探, 2016, 21(6): 58-64.

Yin Nanxin, Yin Zhijun, Han Tao, Hu Zeyun, Zhou Yongshui, Li Renpeng, Cao Cen, Chang Yuli. Sub-layer correlation and stratum superposition patterns of pebbled sandstone section of Carboniferous Bachu Formation in Central Tarim 16 reservoir[J]. China Petroleum Exploration, 2016, 21(6): 58-64.

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