亚诺斯盆地DC区块储层井震结合三维地质建模  

3D geological modeling with well and seismic data of DC block in Llanos foreland basin

作　　者：王焕[1,2] 冯方[2] 马彩琴[2] 李水静[2] 

机构地区：[1]中国地质大学(北京)能源学院,北京100083 [2]中国石化集团国际石油勘探开发有限公司,北京100191

出　　处：《合肥工业大学学报（自然科学版）》2017年第5期673-678,共6页Journal of Hefei University of Technology：Natural Science

基　　金：中国石油化工集团公司科技攻关资助项目(JP08014)

摘　　要：DC区块位于南美亚诺斯盆地东部前隆构造带上,构造幅度低,含油面积小,储层横向变化快,油藏描述难度大。文章通过钻井和地震相结合的建模方法再现了地下真实地质情况。通过钻井分层数据和地震精细构造解释相结合建立了研究区构造模型,构造模型显示区块整体构造呈东高西低的趋势,在主要钻井区,构造呈南北走向的"脊"型分布,受海浪和沿岸流改造作用的影响,"脊"的东侧构造下降幅度大于西侧,这进一步验证了地质认识。在构造模型基础上,通过单井相与均方根振幅属性体相结合,分别利用钻井纵向分辨率高的优势和地震横向分辨率高的优势建立了研究区岩相模型,为下一步寻找有利砂体提供依据。在地质统计学分析的基础上,通过测井解释与波阻抗反演地震数据体相结合建立了岩相模型控制下的储层参数模型。各属性模型之间逐次进行协克里金约束,在多次等概率实现后通过统计计算最终得到不确定性最低、可靠性最高的模型。模型校验结果表明地质模型质量较高,地质模型储量丰度图可为井位设计提供参考,在该地质模型基础上的钻井获得成功。该地质模型的建立及取得的认识可为该盆地同类型油气藏的勘探开发提供借鉴。DC block, with low amplitude structure and small oil-bearing area, is located in the eastern slope of Llanos foreland basin in South America. The reservoir changes fast in horizontal direction, and it is difficult to describe the reservoir characteristic. In this paper, the underground geological condition was recreated by modeling combining well and seismic data. Based on the seismic structure interpretation and layer division data, the structure model was made. The structure model showed that the structure was becoming higher from west to east, and in the main drilling area, there was a north-south ＂ridge＂ shape. By the function of waves and longshore current transformation, the structural decline on the east side was faster than that on the west side, which further strengthened the geological understanding. Based on the structure model, taking the longitudinal advantages of well logging and lateral advantages of seismic data, using single well facies as hard data and sand/shale probability distribution model calculated from seismic RMS attribute as soft data, the lithofacies model was established using sequential indicator simulation. The lithofacies model provided the basis to find favorable sand body in constraints, reservoir the next step. Based on the geostatistics analysis and seismic wave impedance parameter models under the control of lichofacies were set up using sequential Gaussian random simulation technology. Every parameter model was constrained successively, and the final property models with highest reliability were obtained after the calculation of several equalprobability models. Model calibration results showed that the geological model was in high quality, and the reserves abundance map was given, which gave the proposal for the drilling well location. Drilling on the basis of this 3D geological model was successful. This geological modeling process and understanding had a certain reference value to the exploration and development of the similar reservoirs in this basin.

关 键 词：地质建模 地震约束 变差函数 随机模拟 亚诺斯盆地 

分 类 号：P618.130.21[天文地球—矿床学]