| Based on the exploration practice of Tahe and Shunbei oilfields, some scholars initially established a “vertical migration and accumulation” reservoir-forming model of strike-slip fault belts connecting the source rocks of Lower Cambrian. Therefore, it is of great significance to carry out the research on the source-connectivity of the strike slip fault zone and its control on reservoir-forming in Tahe-Shunbei area, in order to guide the next exploration and development of fault-controlled karst reservoirs. Based on the characteristics of fault zone structure, seismic event reflection pattern, amplitude attribute strength and so on, and combined with the statistics of oil, gas and water production capacity of a large number of drilling wells, it is considered that the source-connectivity of strike slip fault zone can be qualitatively evaluated by the contact relationship between strike slip fault and source rock, structural style and activity intensity of fault, and other parameters. If strike slip faults have direct contact relationship with source rocks (seismic reflection structure with fold and fault), fracture zone structure with flower structure and main fault zone with long-term activity, then the source-connecting capacity of strike slip fault is usually strong. The strike slip fault zone in Tahe-Shunbei area can be preliminarily divided into three types: strong source-connecting type of “upper and lower multi-layer connection”, medium source-connecting type of “lower connection and upper concealed” and poor source-connecting type of “upper and lower concealed”. The source-connecting type of strike slip fault zone has good correlation with oil and gas enrichment. The strong source-connecting type is often the most enriched and have better productivity; the degree of oil and gas enrichment of medium-connecting type is decreased, and the productivity is poor to medium; while the productivity of poor source-connecting type is usually very low or even lost. This recognition will play an important role in optimizing exploration targets and expanding exploration achievements of strike slip fault zone. |
