Development techniques for deep complex fault block reservoirs with low permeability in Zhongyuan Oilfield

This article builds up the computational models of the minimum oil-bearing area, development investment, development profit, economic feasibility, decline rules, and economic reserve scale of deep low-permeability reservoirs. Study shows that the minimum oil-bearing area of the marginal reservoir is 0.02 km2; the economic threshold production is affected by reservoir burial depth, price of the crude oil, and operation cost of per ton of oil, of which burial depth and crude oil price are the sensitive factors affecting the economic production capacity; minimum reserve scale is affected by burial depth, recovery and consumption price of the crude oil and the operation cost of per ton of oil, of which burial depth and the consumption price of the crude oil are the sensitive factors affecting the economic reserve scale. Because of the increasing crude oil price, the original low efficiency or invalid reserves could be reestimated as the economic ones. The reservoir Es36–7 of the block Wei 360 is on the edge of the economic development.