| Lungu oilfield is located in the Lunnan low uplift tectonic belt, northern uplift of the Tarim Basin, including Lunguxi, Lungu7, Lungu2, Lunnan4, Sangnanxi, Sangnandong and Lungudong seven oil and gas exploration and development area. The main production layer is middle lower Ordovician carbonate rock reservoir. Structure in the work area is high in the northwest, low in the southeast, generally is a southeast of large slope. The main lithology is sparry calcarenite. There is no correlation between the porosity and permeability. The reservoir heterogeneity is very strong.The Ordovician oil reservoir of Lunguodong is a special type of karst fractured carbonate reservoirs. The Corrosion holes are the main reservoir space of oil and gas. Crack is the main flow channel. The Corrosion holes are irregular in shape, uneven development and randomness in spatial distribution. Because of the multi-phase reservoir and complex fluid distribution, efficient development of the reservoirs and adjustment program is difficult in the area. In this case, the identification of fractured, the analyzing of the connectivity between wells, the dividing fracture-vug unit, the studying of fluid distribution and proposing fluid distribution model is shown particularly important. It is also the key to further improve the effect of reservoir development of Ordovician carbonate fracture-cave.The article identifies the connectivity between wells of Lungudong area by the way of gas chromatographic fingerprint technology. And also divide the fracture-vug unit into five types, Single Oil-Gas Hole, Single Oil-Gas-Water Hole, Single Gas-Oil Hole, Multi-hole of Oil-Gas Cavern and Multi-hole of Oil-Gas-Water Cavern. Combined with drilling, mud logging, logging and seismic data, the article identifie the fractured reservoirs in every single well and divide the karst facies. And then, analysis the longitudinal distribution and plane distribution of the seam hole of Lungudong area. |
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