杭锦旗地区辫状河定量地质知识库建立及应用

为了明确杭锦旗地区辫状河道不同参数的分布范围，指导储层的三维地质建模和储层预测，为井位部署提供地质理论依据，参考辫状河的现代沉积、露头等资料，以杭锦旗地区下石盒子组的钻井资料和沉积微相横向展布、平面展布为基础，通过统计和分析辫状河道和心滩不同参数的分布概率及参数间的相关关系，建立了杭锦旗地区辫状河道宽度、心滩宽度、长度及厚度的定量地质知识库。研究表明，杭锦旗地区心滩长度6 500~8 500 m，心滩宽度3 000~4 500 m，心滩厚度主要在5~14 m，心滩长宽比1.85~2.30，辫状河宽度8 000~18 000 m。利用建立的辫状河道不同微相的定量参数，建立了杭锦旗地区锦58井区下石盒子组的三维地质沉积微相模型，利用该模型进行有利区的优选，并通过实钻井钻遇情况验证了模型的高精度。

Construction of a Quantitative Geological Knowledge Base for the Braided River of Hanggin Banner and Its Application

In this study, a quantitative geological knowledge base covering the width of braided channels, as well as the width, length and thickness of river islands in Hanggin Banner was established by determining and analyzing the probability distribution and correlation among various parameters of braided channels and river islands. For this purpose, up-to-date deposition and outcrop data of braided channels as well as drilling data and lateral and in-plane distribution of sedimentation microfacies in the Lower Shihezi Formation of the study area were employed. The knowledge base serves to determine the distribution range of various parameters of the braided river in Hanggin Banner, and to guide the 3D geological modeling and prediction of reservoirs. It also forms the geological foundation for future well positioning. The length, width, and thickness of river islands in Hanggin Banner area were found to be 6 500~8 500 m, 3 000~4 500 m, and mostly 5~14 m, respectively, with a length to width ratio of 1.85~2.30. The width of the braided river is 8 000~18 000 m. The established quantitative parameters of the various microfacies of the braided channels were used to construct a 3D geological sedimentation microfacies model for the Lower Shihezi Formation of the Gin 58 drilling site in Hanggin Banner. This model was used to select favorable drilling areas. Its precision is demonstrated in actual drilling situations.