CAJ | 학술논문

四川阆中—南部地区裂缝类型主要有成岩缝与构造缝,其低角度斜交缝和水平缝两种结构缝发育最好。千一段溶蚀孔洞一般以圆、椭圆形为主,洞径为2~10mm。大安寨段溶蚀孔洞较发育,孔径主要为0~1mm,溶蚀孔洞大部分被方解石充填。裂缝是形成次生孔洞的重要因素,溶蚀孔洞与成岩期裂缝关系不甚密切,溶蚀孔洞沿构造裂缝发育现象较普遍。
사천랑중—남부지구렬봉류형주요유성암봉여구조봉,기저각도사교봉화수평봉량충결구봉발육최호。천일단용식공동일반이원、타원형위주,동경위2~10mm。대안채단용식공동교발육,공경주요위0~1mm,용식공동대부분피방해석충전。렬봉시형성차생공동적중요인소,용식공동여성암기렬봉관계불심밀절,용식공동연구조렬봉발육현상교보편。
Based on the analysis of cores,cast thin section,scanning electron microscope,well drilling and logging,the main fractures types are found to be diagenetic fractures and tectonic fractures,in Nanbu area of Langzhong,northern Sichuan Basin.Among them,the low angle oblique crossing fracture and horizontal fracture are mostly developed.The diameters of solution fissure are mainly 2~10mm in the forms of roundness or oval in first member of Qianfoya formation.The solution fissures are mostly filled by calcite in Da＇anzhai member.Fracture is an important factor of the secondary holes,and solution pores and diagenetic cracks are not linked,in addition,the solution pores are always developed in the trace of structural cracks.