阿南低渗透砂岩油藏细分开发层系技术

阿南油田位于内蒙锡林浩特北约100km处,为一受构造控制的层状弱边水断块油藏,阿南低渗透砂岩油藏断层发育,构造破碎、主力断块含油井段长、储层物性差,非均质严重。为提高开发效果,对油层厚度大、具备细分层系的主力区块,进行细分开发层系调整。评价认为阿南低渗透油藏主力断块细分4套至5套层系,每套层系控制7～8个小层,油层厚度12～15m时开发效果最佳。方案实施后,提高了储量的动用程度和油藏的水驱程度,开发效果明显好转。

Subdivision of Layer Series of Development in Arnan Low Permeability Sandstone Reservoir

WANG Qun-chao et al Arnan oifield,located100km to the north of Silin-haote in the Inner Mongolia Autonomous Region,is a lay-ered fault block oil reservoir with edge water and con-trolled by structural zones.The low permeability sandstone reservoir has highly developed faults,fractured structures,thick oil-bearing intervals in the major fault blocks,poor physical properties and serious inhomogeneity.Subdivision of layer series of development was carried out in major blocks with thick oil layers.Evaluation showed that devel-opment efficiency was optimal after the oil-bearing layers were subdivided into4to5layer series each of which control 7to8substratum and12to15m thick oil layer.Implementation of the development program enlarged pro-ducing reserves and improved waterflooding efficiency.