准噶尔盆地车排子凸起石炭系火山岩体识别及解剖

Identification and internal anatomy of Carboniferous volcanic reservoir of Chepaizi Uplift in Junggar Basin

为解决火山岩油藏岩性岩相变化大、储层非均质性强、有利储层预测难等问题,以准噶尔盆地车排子地区石炭系火山岩为例,结合岩心、地震、测井等资料,研究火山岩体表征、火山期次划分、火山岩体解剖、优势岩相预测,总结基于岩相、测井相、地震相的三相多属性火山岩体表征特征。结果表明:准噶尔盆地车排子凸起单斜轴部发育7个火山岩体、2个火山通道,火山喷发以中心式喷发模式为主,发生三期火山喷发;纵向上,由深到浅划分为C_(1)、C_(2)、C_(3)期,C_(3)期剥蚀严重,C_(2)期主要发育溢流相火山岩体,C_(1)期发育爆发相火山岩体。爆发相火山岩体物性明显好于溢流相的,火山口附近构造高部位多为优势岩相发育区。该结果为研究区火山岩油藏勘探开发提供指导。

The volcanic oil reservoir is characterized with variable lithology and lithologic facies,strong heterogeneity,hard prediction.Taking the Carboniferous volcanic rocks of Chepaizi Uplift in Junggar Basin as an example,combined with the core,seismic data and well logging,we mainly studied on volcanic rock mass characterization,division of volcanic periods,analysis of volcanic mass, prediction of dominant lithofacies.Based on this,the three phase and multiple attribute characteristics of volcanic rock mass formed by lithofacies,logging facies and seismic facies are summarized.The results show that there are two volcanic channels and seven volcanic rocks in the monoclinic axis of Chepaizi Uplift in Junggar Basin.The volcanic eruption is the central eruption mode which has experienced three periods of volcanic eruption.Longitudinally,the Carboniferous strata from deep to shallow are successively divided into stages C_(1),C_(2) and C_(3).The stage C_(3)was severely denuded.The stage C_(2) mainly developed overflow volcanic rock mass.Eruptive volcanic plutons were developed in stage C_(1).The physical property of volcanic rock mass in the eruptive phase is obviously better than that in the overflow phase.The high tectonic position near the crater is the dominant lithofacies development area.The identification and internal anatomy of volcanic rocks in Chepazi Uplift provide guidance for the exploration and development deployment in this area.