车排子地区石炭系火山岩溶蚀孔洞发育情况分类和分布规律

Development and Distribution of Dissolution Pores in Carboniferous Volcanic Rocks in Chepaizi Bulge

摘要: 准噶尔盆地车排子地区东北部石炭系火山岩溶蚀孔洞发育，是主要的油气储集空间。综合利用岩心描述、薄片观察、成像测井等资料，在成像测井图上识别出溶蚀孔洞并标定到常规测井中，利用成像溶蚀孔洞视参数和常规测井敏感参数表征溶蚀孔洞发育情况。在该基础上，建立了3类溶蚀孔洞发育带的划分标准。研究发现：在不同岩性中，优势溶蚀带主要发育在火山角砾岩中，其次发育在安山岩和凝灰岩中；在空间分布上，优势溶蚀带主要分布在石炭系顶部的风化壳表层以及石炭系内部断层周围。

Abstract: The dissolution pores in Carboniferous volcanic rocks in the northeastern part of the Junggar Basin were the main oil and gas storage space. The dissolution pores were identified from the imaging logging and then calibrated to the conventional logging based on core description, thin slice observation and imaging logging. The development of dissolution pore was characterized by the apparent parameters of the imaging dissolution pores-vugs and sensitive parameters of conventional logging. On this basis, the classification criterion of three types of dissolution pore developed zones is established. The study shows that among different lithologies, the advantageous dissolution zones mainly occur in volcanic breccia, followed by andesite and tuff. In spatial distribution, the dominant dissolution zones mostly exist in the weathering crust surface on the top of the Carboniferous and around faults inside Carboniferous system.