摘要
受复杂构造影响,川西北SYS区块叠前时间偏移成像精度不高,导致实钻构造数据与地震预测构造数据存在较大差异。川中GM区块灯影组气藏受埋深大、非均质性强、储层薄等地质条件制约,储层精细预测难度大,优质储层钻遇率低。为解决SYS区块的偏移归位问题,开展了高精度各向异性叠前深度偏移处理。该技术充分考虑了地下介质的各向异性,在精确求取各向异性参数基础上进行叠前深度偏移,可使地下构造准确归位,避免了陡倾地层信息丢失,提高了地震成像品质,构造勘探误差明显减小,钻探成功率显著提高。为提高GM区块储层钻遇率,根据新完钻井及正钻井资料,压制地震资料中的寒武系底部强振幅反射,并实施叠后高分辨率地质统计学反演、多属性缝洞预测,实时调整钻探目标及井轨迹,确保井轨迹沿优质储层钻进。结果表明,实施钻井、地震、地质一体化跟踪后,部署井位目的层构造深度误差逐年下降,储层钻遇率、平均测试产量、高产井占比逐年增高,进一步印证了井位实时跟踪的重要性。
Due to the complex structure,the imaging accuracy of pre-stack time migration is not high in the SYS area,which results in a large difference between the actual drilled structure data and the structure data from seismic prediction.The gas reservoir of Dengying Formation in the GM area is restricted by geological conditions such as deep burial,strong heterogeneity and thin reservoir.Thus,fine reservoir prediction is difficult,and the high-quality reservoir drilling ratio is low.To improve the migration homing in the SYS area,this paper conducted high-precision anisotropic prestack depth migration.This technique fully considers the anisotropy of underground media and carries out pre-stack depth migration with accurate anisotropy parameters.With the ability to restore the underground structure to the exact position,it avoids the information loss of steeply inclined strata,improves the quality of seismic imaging,and reduces the structural exploration error.The success rate of drilling is thereby increased significantly.To improve the reservoir drilling ratio in the GM area,the paper suppressed the strong amplitude reflection at the bottom of the Cambrian System with the newly completed well and ongoing drilling well data. Moreover,it performed the high-resolution post-stack geostatistical inversion and multi-attribute fracture and cave prediction to adjust the drilling target and well trajectory in real time so that the well trajectory can be made along a high-quality reservoir.The results show that after the integrated tracking of drilling,seismic and geology,the structural depth error of the target zone of the deployment well decreases year by year,and increases are observed in the reservoir drilling ratio,the average testing production and the proportion of high-yield wells.This further confirms the importance of real-time tracking of well location.
作者
李春梅
彭才
张旋
郭鸿喜
段杰
李雯琪
LI Chunmei;PENG Cai;ZHANG Xuan;GUO Hongxi;DUAN Jie;LI Wenqi(Southwest Geophysical Research Institute,BGP Inc.,CNPC,Chengdu,Sichuan 610000,China;Exploration and Development Research Institute,PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610000,China;Exploration Department,PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610000,China)
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2022年第3期656-665,I0006,I0007,共12页
Oil Geophysical Prospecting
基金
重庆市科委自然科学基金面上项目“四川盆地中部晚震旦世大型台缘带发育特征、形成演化及成因机制”(cstc2020jcyj-msxmX0487)资助。
关键词
井位跟踪
各向异性
叠前深度偏移
强振幅压制技术
高分辨率
地质统计学反演
多属性缝洞预测
well location tracking
anisotropy
prestack depth migration
strong amplitude suppression technology
high resolution
geostatistical inversion
multi-attribute fracture and cave prediction
