摘要
近年来,准噶尔盆地玛湖凹陷北斜坡区三叠系百口泉组油气勘探获得重要突破,储层为典型的低孔低渗砂砾岩储层,局部发育"甜点"储层,由于"甜点"与非"甜点"地球物理响应差异小,导致地震预测难度大。为此,在储层成因分析的基础上,采用"相带—河道—物性—裂缝"逐级控制的新思路,预测"甜点"储层的分布。首先,利用高分辨率地震层序地层解释技术得到等时的地质界面,恢复沉积期古地貌,精细刻画相带的边界;然后,采用基于模型正演的地震属性定量分析技术,预测主河道砂体的展布;其次,在叠前CRP道集优化处理的基础上,利用射线弹性阻抗反演技术,预测储层物性的分布;最后,采用高分辨率相干加强技术预测裂缝的分布。经勘探实践证实,这种逐级控制的新思路和新方法,降低了"甜点"储层预测的多解性,值得在类似的地区推广应用。
In recent years,oil and gas exploration has achieved an important breakthrough of the Triassic Baikouquan Formation in the Mahu Depression northern slope area in the Junggar Basin.The reservoir is characterized by low porosity and low permeability sandy-conglomerate reservoir and develops 'sweet point'in local areas.The seismic response difference between the'sweet point'and 'non-sweet point'is small and it is difficult to predict.So,based on the analysis of the reservoir genesis,'face belts-water courses-physical porosities-factures'gradual controlled methods were used to predict the distribution of'sweet point'reservoirs.Firstly,we got chronohorizon by high resolution sequence stratigraphy technology,reconstructed the paleogeomorphic and described the boundary of facies-belt.Secondly,we predicted the distribution of sandstone in main channels by the analysis of seismic attributes based on forward modeling.Thirdly,we predicted the distribution of porosity by the ray elastic impedance inversion based on CRP gather optimization process.Finally,we predicted the fracture distribution by high-resolution coherence method.After exploration practices,these methods can reduce the multiple solutions of'sweet point'reservoir prediction,so it can be used in other areas as well.
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2015年第S1期154-161,共8页
Natural Gas Geoscience
基金
国家重大科技专项"十二五"计划课题"天然气复杂储层预测与烃类检测地球物理技术研究和应用"(编号:2011ZX05007-006)资助
关键词
“甜点”储层
逐级控制
高分辨率解释
模型正演
优化处理
准噶尔盆地
'Sweet point'reservoir
Gradual control
High resolution interpretation
Forward modeling
Optimization processing
Junggar Basin
