论文详情
薄储层预测是油气勘探开发的难点,准噶尔盆地中部庄3工区三工河组砂岩属于典型的深埋储层,其中二二亚段砂体厚度薄、横向变化快,非均质性强。为解决薄储层预测问题,需要对薄储层地震资料进行拓频处理。采用混合相位子波反褶积技术,以信噪比谱为参考,测井曲线为监督,拓宽地震频带,提高主频,并利用拓频后的地震资料进行高分辨率波形指示反演,预测储层砂体平面展布情况和厚度。针对岩性横向变化快、非均质性强的难题,在砂体厚度预测的基础上进行孔隙度模拟,将砂体厚度预测结果和孔隙度预测结果叠合显示,明确储层物性变化规律。结果表明,波形指示反演得到的储层预测结果有效提高了纵、横向分辨率,成功预测了砂体边界、砂体厚度以及砂体物性,预测的砂体厚度与已知钻井结果吻合程度较高,同时也符合研究区的沉积规律,为钻探目标的优选以及开发评价提供了重要依据。
Thin reservoir prediction is a prevalent issue that limits oil and gas exploration and development.The Sangonghe Formation in the Zhuang-3 block in the central Junggar Basin is a typical deep sandstone reservoir.The sand layers in the second sub-member are thin and characterized by high lateral spatial variability and pronounced heterogeneity.To better identify these thin reservoirs,the seismic data were first processed by expanding the frequency band through the mixed-phase wavelet deconvolution method.This method uses the signal-to-noise ratio spectrum as a reference and well data for validation to broaden the seismic frequency band and improve the main frequency.The expanded seismic data were then used for high-resolution seismic motion inversion to predict the plane and profile of the reservoir sand body.In view of the lateral variability and heterogeneity,porosity inversion was performed based on sand body thickness prediction.Then,the thickness prediction map and porosity inversion map were overlapped to clarify the characteristics of reservoir physical properties.The results showed that seismic motion inversion effectively improved the vertical and lateral resolutions of the reservoir.The boundary,thickness,and physical properties of the reservoir sand could be predicted satisfactorily.In fact,the prediction results were practically coincident with the logging data and with the sedimentary succession of the region.These results provide an important basis for the optimization of drilling targets and the evaluation of the production.
国家科技重大专项“准噶尔盆地碎屑岩层系油气富集规律与勘探评价”(2016ZX05002-006)资助。