川东石炭系测井地质  

LOG GEOLOGY OF CARBONIFEROUS IN EAST SICHUAN

作　　者：涂涛[1] 刘兴刚[1] 黄平[1] 

机构地区：[1]四川石油管理局地质勘探开发研究院

出　　处：《天然气工业》1998年第2期24-26,共3页Natural Gas Industry

摘　　要：根据川东石炭系储层的地质特点，将川东石炭系储层按储集性能划分为石灰岩、孔隙发育白云岩、孔隙不发育白云岩三部分。经勘探实践证实，可作为储层的主要是孔隙度高、裂缝发育的白云岩，因此识别石炭系储层中孔隙高、裂缝发育的层段就成为储层评价的一个重要方面。由于测井资料在纵向上可以较准确地反映岩石岩性及物性的差异，故我们综合利用地质、测井资料获取了川东石炭系不同岩性或同一岩性不同物性的六个常规测井系列的测井特征值，并对所获得的测井特征值进行反演，证实了该测井特征值是成立的。应用此测井特征值可以将石炭系储层中的孔隙发育白云岩、孔隙不发育白云岩和石灰岩区分开，并且可以判别岩石孔隙中的含流体情况。同时，建立了孔隙度与密度、声波时差的相关性模型，根据它们之间的相关性，可以确定云岩孔隙发育中的孔隙度值。将文中所述测井特征值应用到地震处理中，可以预测石炭系的岩性及物性变化。In accordance with the geological properties of the Carboniferous reservoir in East Sichuan,it can be divided into three parts as the limestone,pore developed dolomite and pore undeveloped dolomite according to its reservoir properties.Through exploration,it is proved that the fracture developed dolomite with high porosity may be mainly taken as the reservoir,therefore,to recognize the fracture developed intervals with high porosity becomes an important aspect of reservoir evaluation.Owing to the fact that the vertical variations in lithological and petrophysical properties may be relatively accurately reflected by log data,the log eigen values of six conventional logging suites for various lithological properties or the same lithology with various petrophysical properties of the Carboniferous in East Sichuan are obtained by use of the geological and log data comprehensively,and through the inversion of the log eigen values obtained,it is proved that they are authentic.In the light of the log eigen values,the pore developed dolomite,pore undeveloped dolomite and limestone in the Carboniferous reservoir can be divided and the fluid bearing situation in the pores of rocks can also be judged.Meanwhile,the models of the correlation between the porosity,density and interval transit time have been set up,and according to the models of the correlation,the porosity values of the pore developed dolomite may be determined.When the log eigen values mentioned above are used for seismic data processing,the lithological and petrophysical variations in the Carboniferous may be forecasted,then the lithological trap can be fixed.

关 键 词：盆地 石炭纪 白云岩 石灰岩 测井 

分 类 号：P631.81[天文地球—地质矿产勘探]