基于沉积相控的优质储层预测——以鄂尔多斯盆地X区块下石盒子组致密砂岩气为例

High-quality reservoir prediction based on sedimentary facies control technique:taking tight sandstone gas of X block in Lower Shihezi Formation of Ordos Basin as an example

X区块致密砂岩气受储层非均质性及地震资料品质的影响,优质储层预测存在多解性。文中在岩心相、测井相、地震储层预测的基础上,结合厚度串珠法、地质知识库及水动力与物性的关系,综合开展沉积微相平面展布研究。研究发现:沉积微相控制着储层岩性、结构、物性及含气模式;在沉积相控下,结合产能情况进行优质储层预测。依据水平井资料钻遇及新投产井产能验证,优质储层预测准确度较高,表明该技术在X区块具有较好的应用价值。

The tight sandstone gas X of block is affected by reservoir heterogeneity and seismic data quality,so there are multiple solutions for high-quality reservoir prediction.On the basis of core facies,logging facies and seismic reservoir prediction,this paper studies the distribution of sedimentary microfacies in combination with thickness beading method,geological knowledge database and the relationship between hydrodynamics and physical properties.It is found that sedimentary facies control reservoir lithology,sand structure,physical properties and gas-bearing pattern.Under the sedimentary microfacies control technique,the high quality reservoir is predicted with the productivity.The prediction results of high quality reservoir were verified by drilling data of horizontal wells and production capacity of new wells,with a high degree of coincidence,indicating that this technology has practical application value in X block.