基于地震信息的低井控致密气藏三维地质建模——以四川盆地梓潼区块为例

Three-Dimensional Geological Modeling of Low Well Control Tight Gas Reservoirs Based on Seismic Information—A Case Study of Zitong Block in Sichuan Basin

摘要: 四川盆地中生代砂岩储层作为典型的特低孔渗储层，是我国近年来致密砂岩气勘探开发研究的焦点。由于梓潼区块尚处于探评初期，区内井控程度低，钻井资料少，且未系统开展三维地质建模。导致无法明确产能主控因素和确定高效开发技术对策，大大阻碍了气田开发进程。因此，本文通过测录井、构造、储层属性等资料，建立构造模型，并通过地震信息约束建立确定加随机的优势相模型，再结合孔隙度及AVO属性体建立相控储层孔隙度、渗透率及含气饱和度模型。

Abstract: The Mesozoic sandstone reservoirs in the Sichuan Basin, as typical ultra-low porosity reservoirs, have been the focus of research on the exploration and development of tight sandstone gas in China in recent years. As the Zitong block is still in the early stage of exploration and evaluation, the well control degree in the area is low, the drilling data is scarce, and the three-dimensional geological modeling has not been systematically carried out. This has led to the inability to clearly identify the main control factors of production capacity and determine the technical countermeasures for efficient development, which has greatly hindered the development process of gas fields. Therefore, in this paper, a structural model is established based on data such as logging and logging, structure, and reservoir properties. A deterministic and random dominant phase model is established through seismic information constraints. Combined with porosity and AVO property bodies, the porosity, permeability, and gas saturation models of phased reservoirs are established.