基于潜山古地貌的风化带厚度预测分析

Prediction and Analysis of Weathered Zone Thickness Based on the Ancient Landscape of Buried Hill

摘要: BZ潜山气田是位于渤海湾的太古界潜山裂缝气藏，BZ区域太古界潜山经历了多期构造运动，顶部发育了厚约40~350 m的风化带储层，BZ潜山气田的储量主要集中于风化带储层。因此，风化带的厚度分布研究对该气田的开发尤为重要。本文利用岩心、钻井资料和地震资料，通过古地貌恢复和风化带的特征分析，建立了古地貌相对高度与风化带厚度的函数关系，进而定量预测了本区风化带的厚度分布，为BZ潜山气田的储量品质分析及开发布井提供了依据。

Abstract: The BZ buried hill gas reservoir is a fractured gas reservoir of the Archaeozoic buried hill located in the Bohai Bay. The Archaeozoic buried hill in the BZ area has undergone multi-phase tectonic movements, and a weathering zone with a thickness of about 40 - 350 m has developed at the top. The reserves of buried hill gas reservoirs in BZ Archean are mainly concentrated in the weathered zone, so the study on the thickness distribution of the weathered zone is particularly important for the development of the gas field. In this paper, the functional relationship between the relative height of the ancient landform and the thickness of the weathering zone is established based on analyzing the characteristics of weathering zone and palaeogeomorphic restoration by using the core, drilling data and seismic data, and then the thickness distribution of the weathering zone is quantitatively predicted, which provides the basis for the reserves quality analysis and developing well plan of the BZ buried hill gas field.