鄂尔多斯盆地演武—三岔地区长3储层评价综合研究

COMPREHENSIVE EVALUATION OF CHANG3 RESERVOIR IN YANWU-SANCHA AREA,ORDOS BASIN

延长组长3油层组作为鄂尔多斯盆地演武-三岔地区下一步油气勘探开发的接替层位,目前,已在研究区西部获得连续突破,并显示出了良好的勘探开发潜力。但因矿权面积大,勘探程度低,且油藏分布相对复杂,加之区域前期未有较好的油气发现,直接制约了后期油藏勘探评价工作。本次研究,在储层岩石学特征、成岩作用、微观孔喉特征和物性特征系统研究的基础上,通过选取关键地质参数,建立符合实际需求及区块地质特征的评价标准,对研究区长3油层组开展储层综合评价。将研究区长3储层类别依次划分为4类,其中,长33小层Ⅰ类优质储层发育,Ⅱ类储层各小层分布广泛,是今后重点勘探层位。通过本次研究,为后期演武-三岔地区长3储层预测以及有利目标区优选指明了方向。

Chang3 oil reservoir group of Yanchang Formation,as the next successive layer for oil exploration and development in Yanwu-Sancha area of Ordos Basin,has made continuous breakthroughs in the western part of the study area,showing good exploration and development potential. However,due to the large area of mineral rights,low degree of exploration,relatively complex distribution of reservoirs,and the lack of better oil and gas discovery in the early stage of the region,the exploration and evaluation of reservoirs are directly restricted lately.Based on the systematic study of reservoir petrology,diagenesis,micro-pore throat characteristics and physical characteristics,this study establishes an evaluation criterion that meets the actual needs and block geologicalcharacteristics by selecting key geological parameters,and carries out comprehensive reservoir evaluation for Chang3 reservoir group in the study area. Reservoir types of Chang3 in the study area are divided into four categories in turn. Among them,Chang333 is well developed in the first category of high quality reservoirs,and the second type reservoirs are widely distributed,which will be the key exploration horizons in the future. Through this study,it points out the direction for the prediction of Chang3 reservoir in Yanwu-Sancha area and the optimization of favorable target areas.