Gallery East Oil Field Geological Studies And The Overall Adjustment Program Prepared

The Langdon oil field locates the north carries of the Jizhong depression Langgu sag Hexiwu structure. The verification oil-bearing area is 9.88 km2. The calculated second grade reserves is 465.93×104t, recoverable reserves is 70×104t.After the development well net had been drilled over at March 1984, the oil field was started to develop completely at November. It realized water flooding in June 1985.The production per day was up to 237.lt early days. But henceforth affected by various factors the oil well production decreased fast and the water-injecting well injecting water volume descent obviously. Resulting in the oil wells most stopped producing, water-injecting wells stopped all. The development appeared abnormality difficult. Lang dong oil field became the low effect development oil reservoir with reputation corresponding to reality. This deviated seriously from current "economic benefit cored" developing policy.Every kind of self-contradict exposed through the development process embodied a concentrated reflection the deficiency knowledge tothe structure, the reservoir evaluation, and unsuccessful research towater-flooding adaptability. Therefore, enhanced the deep level geology comprehensive research, put forward suitability managing and reforming program had become the important factor to solve Langdon oil-field development problems.In order to change the passive situation, we launched multi-aspects geological research.1.We proceeded stratigraphic classification and fine correlation research adequately using seismic area geological and well logging data, using the views of sequence stratigraphy and sedimentary microfaciestechnology;Secondly, estimated the reservoir layer parameter distributing regulation;Finally, had being use of the 3-dimention visualization techniques to exhibit the sand distribution regulation at 3-dimention spaces.2. Discernment of low resistance oil-gas. We formulated a parameterporosity, permeability, saturation calculating method and plate, enhancedthe capacity of discernment to low resistance oil-gas layers.3. For the above-mentioned major achievements, we mapped out integral adjustment plan.We had accomplished reformed measures working quantities together15 wells. The production a day of the fault block increased from original20.0t per day to 101t per day, and the producing velocity was speeded up from original 0.15% to 0.8%.