神木北地区上古生界断裂构造分析及其影响

神木北地区位于鄂尔多斯盆地的东北部,富集油气资源,其在上古生界太原组、山西组和石盒子组上发育小型正断层、逆断层、个别切割能力较强的走滑断层及高角度裂缝,由构造作用产生的断层、裂缝及后期由烃源岩内部异常高压使泥岩破裂所形成的裂缝都影响油气运移和油气田分布。该文利用地震资料、钻井资料、测井资料和成像资料结合人工地震合成记录标定法、野外露头调查法等对地震资料处理、解释和结合野外露头调查法、岩心观察法,镜下薄片鉴定法和成像测井方法等识别裂缝构造、发育类型和发育基本规律,上述方法对神木北地区的油气资源勘探,具有重要的研究意义和具体的应用价值。

The northern Shenmu region is located in the northeastern part of the Ordos Basin,known for its abundant oil and gas resources.In the Paleozoic Taiyuan Formation,Shanxi Formation,and Shihezi Formation,there are small-scale normal faults,reverse faults,strike-slip faults with strong cutting abilities,as well as high-angle fractures.Faults and fractures generated by tectonic activity,as well as fractures formed by the fracture of mudstone due to abnormally high pressure within source rocks,all have an impact on the migration of oil and gas and the distribution of oil and gas fields.This paper utilizes seismic data,drilling data,well logging data,and imaging data,combined with methods such as synthetic seismogram calibration using artificial seismic records and field outcrop investigation.It employs techniques such as core observation,thin-section identification,and imaging logging to identify fracture structures,their development types,and basic development laws.The above methods have significant research significance and practical application value for oil and gas exploration in the northern Shenmu region.