高分辨率地震解释预测礁滩相储集层  

Prediction of Reep-Flat Reservoir Using High Resolution Seismic Interpretation

作　　者：吕其彪[1] 吴清杰[1] 毕有益[2] 

机构地区：[1]中国石化西南油气田分公司勘探开发研究院德阳分院,四川德阳618000 [2]中国石化西南油气田分公司勘探开发研究院,成都610081

出　　处：《新疆石油地质》2012年第5期557-559,共3页Xinjiang Petroleum Geology

摘　　要：川东北元坝地区长兴组礁滩相碳酸盐岩储集层埋深平均为7 000 m,厚度小,非均质性强,储集层与非储集层纵波阻抗叠置,叠后地震纵波阻抗反演不能满足目前该地区勘探开发一体化需要。为充分利用地震信息进行高精度储集层预测及降低预测的不确定性和钻井风险,开展了叠前地质统计学反演研究。该方法综合地震振幅随偏移距的变化(AVO)信息、测井及地质认识,运用岩石物理建模,在地质格架模型约束下,以地震数据为硬约束,进行叠前地质统计学反演,得到岩性反演剖面。反演结果纵向和横向分辨率高,平面预测规律可靠,可有效地实现薄储集层的反演和预测,提高了储集层预测精度,降低了钻井风险。The reef-flat carbonate reservoir of Changxing formation in Yuanba area in northeastern Siehuan basin is eharaeterized by average buried depth of 7 000 in, thin in thickness, serious heterogeneity and superimposed P-wave impedance between reservoir and non-reservoir intervals. So the seismic P-wave impedance inversion after poststack can not meet the needs for integration of exploration anti exploitation at presenl. In order to get a high resolution predictable reservoir characterization and reduce the uncertainty of such a prediction and the drilling risk, the study of prestaek geostatistie inversion is carried out by fully using available seismic information. This method integrates with seismic AVO information, well logging and geological recognition, including petrophysieal modeling, geological frame model and seismic dala restriction, prestaek geostatistie inversion. Finally, the litholngie inversion profile is obtained. The resuh shows high vertical and horizontal resolution and reliable lateral prediction, which allows the inversion and prediction of thin reservoirs to be effectivelv realized, thus improving the precision and reducing the risk of reservoir prediction.

关 键 词：四川盆地 元坝地区 礁滩储集层 叠前地质统计学反演 地质格架 岩性反演 

分 类 号：P631.445.81[天文地球—地质矿产勘探]