高精度储层预测在腰英台嫩四段致密储层中的应用

High precision reservoir prediction in sand body of K_2n^4 layer in Yaoyingtai area

松南长岭腰英台地区嫩四段Ⅳ砂组和Ⅵ砂组两个含油砂组主要受控于北部远源三角洲沉积体系,为三角洲前缘外带—前三角洲沉积,砂体薄,展布范围较大,但是砂体变化快,物性差,属于致密储层,地层为砂泥薄互层,地震速度变化快,圈闭类型主要发育构造—岩性复合型隐蔽圈闭。在腰英台嫩四段的构造地质特征和物探资料基础上,通过测井资料参与的地质统计学小时窗约束反演技术预测致密砂岩,能够获得更可靠的致密储层信息,纵向能够识别2 m左右的砂岩,为腰英台嫩江组致密储层进一步勘探和开发提供了有力的技术支持。

In the Yaoyingtai area of Changling depression, Southern Songliao basin, the sand group IV and VI existed in K2 n4 layer,which are frontal zone to predelta deposition, are mainly controlled in the delta sedimentary system of northern far source. It has thin sand bodies with huge distribution range, but the sand bodies change fast, while the physical property is poor, which lead it to be a tight reservoir. The formation is a thin sand-shale interbed with fast seismic velocity, and the trap types are mainly developed structural lithologic with subtle traps. Based on the geological features and geophysical prospecting data of Yaoyingtai area, more reliable information on tight reservoir is obtained, the longitudinal depth can reach 2 meters, by using the constrained geostatistical inversion technique with well logging in short time windows, which provides a powerful technical support for the further exploration and development of K_2n^4 formation.