储层地质建模方法在克拉2气田气藏描述中的应用

THE USE OF RESERVOIR GEOLOGICAL MODELING IN GAS RESERVOIR DESCRIPTION:EXAMPLE FROM THE KELA 2 GAS FIELD

在地表条件恶劣、地下地质情况复杂、井眼少的条件下 ,为了弥补勘探阶段资料的不足、更好地认识评估沉积储层特征、减小勘探风险 ,有必要选择合适的露头作为野外储层实验区 ,并从沉积学入手展开研究 ,建立储层地质资料库。通过露头剖面和井下沉积相对比分析 ,建立沉积模式 ,确定不同时期沉积相的展布。通过露头剖面砂体追踪以及砂体内部建筑结构要素分析 ,建立砂体骨架原型模型。结合钻井和测井资料 ,采用随机模拟方法建立储层地质预测模型 ,并按一定的地质规律预测井间砂体空间叠置及夹层分布规律。储层地质建模方法成功地运用于库车坳陷克拉 2气田气藏描述 。

In the stage of exploration, to make good evaluation of the reservoir characteristics, to decrease exploration risk and investment, it is necessary for us to erect a geological knowledge base in order to make disadvantage of the lack of data. This is because, in this stage, there may has bad ground conditions, sophisticated underground geological situations and rare wells. To do this, suitable outcrops should be selected as the experimental area of the field reservoirs. By the analysis of the outcrop profile and the sedimentary face correlation, we can make sedimentary models so that the distribution of faces in different time can be defined. At the same time, the tracing of the sandstone outcrop in the profiles and the analysis of the compositional factors can make the models of the original sandstone framework. Subsequently, with the combination of logging and drilling data, the geological prediction model of reservoirs can be made through the random modeling method. On doing this, prediction of the sandstone superimposition between different wells in space and the interbed distribution rules can be realized on account of certain geological laws. Kuche depression is located in front of Tianshan mountain. The tectonic and ground conditions are very complicated; seismic imaging in the mountain areas and signal\|to\|noise ratio are low; drilling in these areas is of unexceptionally difficult. Due to all of these reasons, it is very important to make geological models of reservoirs. This method has been used in the reservoir description in Kela 2 gas field successfully. For the evaluation of the reservoir quality and potentiality in the gas field, it is a reliable method.