红车断裂带火山岩储集层裂缝特征

Characteristics of Volcanic Reservoir Fractures in Upper Wall of HongChe Fault Belt

根据岩心裂缝观察和测井资料研究,发现红车断裂带裂缝类型主要包括4种非构造缝(层间缝、缝合线、溶蚀缝和成岩缝)以及4种构造缝(水平缝、低角度缝、斜交缝和高角度缝)。统计发现,红车断裂带约50%裂缝全充填,37%半充填,13%未充填。充填物有方解石、硬石膏、沸石、硅质、绿泥石以及其他自生矿物。裂缝宽度0.1～20 mm,以1～4 mm为主;90%以上的裂缝倾角分布在10～50°,裂缝走向以北东向为主,次为近南北向和北西向。裂缝发育的有利构造部位主要是构造高点、构造交汇点和断层发育区,裂缝发育程度随储集层岩石的脆性增加而增加,裂缝发育程度与开度均随储集层埋深增加而减小。

The fractural types in Hongshanzui-Chepaizi（HongChe） fault belt in Junggar basin mainly include 4 non-structural fractures（interlayer fracture,stylolite,dissolution fissure and diagenetic fissure） and 4 structural fractures（horizontal fracture,low-angle fracture,diagonal seam and high-angle fracture）,according to the study of core fracture and well logging data.The statistics show that about 50% of HongChe fault fractures are totally filled,37% semi-filled,13% unfilled.The types of filled minerals are calcite,anhydrite,zeolite,silica,chlorite,and other authigenic ones.The fissure width ranges from 0.1 mm to 20 mm,dominated by 1～4 mm;the fractural dip ranges from 10° to 50°,which account for more than 90% of statistical fractures.The trend of the fractures is dominated by NE,the secondary is near SN and NW.Favorable structural positions where fractures developed are mainly on structural highs,structural intersection and fault-developed area.The fracture developing extent is increasing with the increase of fragility of reservoir rocks.The fracture development and opening are all decreasing with the increase of reservoir burial depth.