准噶尔盆地C47井区火山岩优质储层预测

摘要

为提高准噶尔盆地C47井区火山岩优质储层的预测精度,提出"一体一藏"的成藏模式.利用地震剖面的反射特征与测井、录井资料的岩性变化以及与上覆地层的不整合接触关系,对C47井区火山岩内部岩体进行重新刻画,寻找出类似于沉积岩特征的多个独立岩体;对每个岩体内各井的岩电特征进行分析,制作岩性图版分析反演的理论可行性;反演从剖面及平面上与实际试油数据进行对比分析,论证研究的可行性.研究表明:研究区岩体内部存在较好的层序反射特征,存在类似沉积岩的可连续追踪的地层特征;石炭系火山岩优质储层主要以火山角砾岩和安山岩为主,主要分布在第2、3套岩体内;自然伽马、电阻率曲线及波阻抗能较好的区分火山角砾岩与安山岩;目前预测目的层已见油气显示.该项研究得到一套针对火山岩储层预测的有效方法,对火山岩储层研究具有重要的指导意义.%For increasing prediction accuracy of fine volcanic reservoirs in C47 well field in the Junggar Basin, the hydrocarbon accumulation mode of "each reservoir body is one pool" was proposed.By utilizing seismic section reflection feature, lithology variations of well logging and mud logging data and the unconformable contact relation with overlying formations, the rock masses inside the volcanic rocks in C47 well field were depicted again to seek several independent rock masses similar to deposit rock features.By analyzing the rock electrical characteristics of each well in all the rock masses, the lithology plate was made to analyze the feasibility of the inversion theory.By comparing and analyzing the inversion results and actual well testing data on section and plane, the feasibility of the study was discussed.The study results indicate that the insides of the rock masses in the study area have better sequence reflection feature, with the stratigraphic feature that can be continuously traced that is similar to deposit rocks.The fine Carboniferous volcanic reservoirs are chiefly volcanic breccia and andesite, mainly distributed in the 2nd and 3rd rock masses.GR, RT curves and wave impedance can better distinguish volcanic breccia and andesite.The currently predicted target layer has oil and gas shows.This study obtained a set of effective methods to predict volcanic reservoirs, with important guiding significance for studying volcanic reservoirs.