大牛地气田二叠系山西组单砂体预测技术及应用

大牛地气田二叠系山西组为三角洲平原沉积,岩性主要为砂泥岩互层,并发育多套煤层、煤线。由于煤层、煤线的低频强干扰作用,使得储层预测工作难度很大。该文主要介绍了应用基于模型的井震联合反演技术,得到时间和深度域的波阻抗、岩性、物性和含气性参数,成功地进行了单砂体含气性预测,并进行了水平井轨迹设计,2口水平井预测直井段深度、厚度与实钻结果吻合较好,DF2井沿预测水平段沿气层钻进733多米,取得了良好的钻探效果。

Prediction of single sand body and its application in Shanxi Formation of Permian, Daniudi Gas Field

The Permian Shanxi Formation in the Daniudi Gas Field was deposited in delta plain environment.It was composed of interbedded sandstone and mudstone,and also generated several sets of coal and coal line.Due to the low-frequency strong interference of coal and coal line,reservoir prediction was very difficult.The model-based well-seismic inversion technique was introduced in this paper,by means of which the wave impedance of time and depth domains,lithology,physical property and gas-bearing parameters might be obtained.The prediction of single sand body was successfully carried out,and the trajectory design of horizontal wells was made.The predicted vertical well depth and thickness matched well with actual drilling in two wells.In the predicted horizontal segment in well DF2,it was drilled for over 733 m along gas reservoir,achieving good results.