准噶尔盆地西缘石炭系车排子地区火山岩储层裂缝形成机理研究

Study on the Formation Mechanism of Volcanic Rock Reservoir Cracks of Chepaizi Area in the West Margin of Junggar Basin

根据野外露头、岩心观察及岩石薄片显微镜下鉴定,结合钻井资料和地震资料分析,认为车排子地区火山岩储层发育各种不同成因机制的裂缝,这些裂缝的存在极大的改善了研究区火山岩储层的储集物性,对研究区油气富集成藏具有重要的决定意义。通过对研究区这些裂缝的发育特征的研究我们认为研究区裂缝的形成机理是岩石性质和岩石组合、构造应力作用、早期和后期成岩作用的共同作用引起的,其中后期构造作用的影响尤为明显。

According to the field outcrop, core observation and rock thin section data, combined with drilling data and seismic data analysis, it＇s pointed that the volcanic reservoir in Chepaizi area developed cracks due to various genetic mechanisms, and the existence of these cracks greatly improved the reservoir properties of volcanic reservoir in the study area. Through the research on development characteristics of these fractures in the study area, it＇s believed that the formation mechanism of the fracture in the study area was cooperative effect of the rock properties and the rock assemblage, the tectonic stress, the early and late diagenesis, and the influence of late tectonism was obvious.