以苏里格气田苏76区块三维地震区为例,综合应用地震属性提取及分析技术,结合地质、测录井等多种资料,在层位精细标定和构造精细解释的基础上,提取40多种地震属性,从中优选出与研究目标有关的最敏感的均方根振幅、平均瞬时频率、最大波峰振幅、总能量4种地震属性,并依据这4种地震属性的分布特征,对储集层的平面分布特征进行了描述.在此基础上,结合实钻井的动、静态资料进行综合分析,认为S55、S76-6、S76-18等井区的强振幅、低频反射区为有利储集层发育带.

Su-76Block in Sulige Gasfield is a typical 4-low gas reservoir,low porosity,low permeability,low abundance and low pressure.Its geological conditions are complex,reservoir sand bodies are multi-stage stacked vertically and contiguous composite horizontally,and the reservoirs have strong heterogeneity.Effective reservoirs are thin,the effective thickness of sandstone in the target layer He 8is 7~11m,the thickness of single gas layers is thin with only 2~5mand economic efficiency is poor for vertical wells.As to the implementation of horizontal wells in the block,the authors described the optimized deploying principles and the combination of well and seismic,static and dynamic,point,lines and surface in the well area,the integrated well construction method with multi-parameter,multi-angle to confirm each other.According to the comprehensive geological research,combined with the main factors of design for the horizontal trajectorythe paper defined the horizontal layer position,length and track orientation of the target zone,emphasized the "twostage,three-combination,four-contrast" as the keys for sticking window point and realizing horizontally controlling of a horizontal well in geosteering while drilling.The development effects of the horizontal wells in the area showed that the average sandstone rate of drilling in Su-76Block for the horizontal wells is 87.2%,with an average rate of 49.9%for drilled gas layers and average daily gas production of a single well is 4.53×104 m3.