基于构造稳定性的断层垂向封闭能力评价

Application of seismic reconstruction inversion in remaining oil prediction of Daqing Placantieline

侯亚伟 杨庆红 黄 凯 罗宪波 吴婷婷 宋来明

中海石油（中国）有限公司天津分公司渤海油田勘探开发研究院，天津 300452 中海油研究总院，北京 100027

以渤海海域某油田为例，应用地质、钻井、测井及完井等多学科数据建立了完整的断层地质力学模型。在此基础上，从断层稳定性出发，提出了断层垂向封闭性评价模型，定义了断层垂向封闭性指数（FVSI），以此定量表征断层的垂向封闭能力和稳定性；并利用蒙特卡洛模拟考虑了输入参数的不确定性，给出了断层垂向封闭能力的概率分布，为水驱开发油藏地质性溢油风险的量化评价提供了理论依据。

This paper reconstructs the pseudo-acoustic curve by fusing the low-requency component of wave impedance curves and the high frequency components of spontaneous potential and taking the reconstruction inversion of P reservoir in G Area of Daqing Placanticline as an example. The constrained sparse spike inversion, the characteristic parameter reconstruction inversion and the processing after inversion are carried out. By broadening the reconstruction of seismic frequency band inversion method, the resolution of the seismic inversion can be improved, the docking relationship of sand body and its distributing feature of the reservoir space are better defined. Study results show that the sandstone more than 5 m and the thin sandstone about 2 m can be cognized longitudinally. Sand body is in narrow banded and distributes discretely, so the heterogeneity becomes more prominent in the plane and interlayer. Water absorption greatly changes in the different facies belt, appearing intermittent water absorption, even no water. Numerical simulation study shows that the remaining oil mainly concentrates in the reservoirs of oilfield edge and the cross-well channel sand, and the space of remaining oil increases. This study fully taps the potential of seismic data and reunderstands the structure and reservoir of developed oilfields. The reservoir distribution characteristics and the remaining oil potential are further defined.

10.6056/dkyqt201302008