葡南扶余试验区裂缝分布及其对水驱开发效果的影响
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摘要
扶余油层为低渗透砂岩油藏,其地质特点为油层物性差、砂体厚度薄、平面非均质性严重、裂缝发育不均、开发难度大。为解决"适合扶余油层有效开采井距、裂缝、提高开发效果"等问题,以"厚度较发育、试油效果较好、储量丰度较大、开发评价程度较高"为区块优选原则,在三维地震资料解释的精细构造及储层岩性反演研究结果的基础上,开辟了葡333-462试验区。以葡333-462区块为研究基础,分析了葡南扶余油层裂缝成因及葡333-462区块裂缝特性;探讨了裂缝对试验区块含水、注水强度、日产油开发效果的影响。结果表明,扶余油层成岩后经历了1次抬升、3次不同方向的挤压作用,裂缝发育程度较强;裂缝的存在和发育程度对油层注水开发有双重作用,即改善油层的出油能力和吸水能力,同时造成方向性水窜,影响水驱开发效果。
The Fuyu Reservoir was a sandstone reservoir with low permeability,the geological features included poor physical property,less thickness of sandbody,serious plane heterogeneity,uneven fracture growth and difficult oilfield development.To solve the problems,such as "effective well space and fractures suitable for Fuyu Reservoir,enhancing the effect of development",the optimal principles were established for the block,which included "hickness growth and better effect of oil testing higher reserves abundance and higher appraisal degree." On the basis of the three dimensional seismic data explanation of fine structures and result of reservoir lithologic inversion,the test areas Pu 333-462 was established.The Block Pu 333-462 was used as research foundation,the fracture genesis of Fuyu Reservoir and fracture features of Block Pu 333-462 were analyzed;the influence of the fractures on the effect of water content,water injection intensity and daily production was discussed.The result indicates that Fuyu Reservoir experiences 1 elevation period,3 squeezing actions in different directions with higher degree of fracture growth.The fracture existence and the growth degree have the dual functions to water flooding development,that is the oil producing ability and adsorption capacity are improved,simultaneously it creates the directive waterchanneling,affects the water flooding development effect.
The Fuyu Reservoir was a sandstone reservoir with low permeability,the geological features included poor physical property,less thickness of sandbody,serious plane heterogeneity,uneven fracture growth and difficult oilfield development.To solve the problems,such as "effective well space and fractures suitable for Fuyu Reservoir,enhancing the effect of development",the optimal principles were established for the block,which included "hickness growth and better effect of oil testing higher reserves abundance and higher appraisal degree." On the basis of the three dimensional seismic data explanation of fine structures and result of reservoir lithologic inversion,the test areas Pu 333-462 was established.The Block Pu 333-462 was used as research foundation,the fracture genesis of Fuyu Reservoir and fracture features of Block Pu 333-462 were analyzed;the influence of the fractures on the effect of water content,water injection intensity and daily production was discussed.The result indicates that Fuyu Reservoir experiences 1 elevation period,3 squeezing actions in different directions with higher degree of fracture growth.The fracture existence and the growth degree have the dual functions to water flooding development,that is the oil producing ability and adsorption capacity are improved,simultaneously it creates the directive waterchanneling,affects the water flooding development effect.
引文
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[3]柳家奎,白全明,陈琰,等.王场背斜构造裂缝性油藏注水开发特征研究[J].石油天然气学报,2005,27(4):480~482.
[2]程格.安塞油田坪北区低渗透油藏裂缝的利用与改造[J].江汉石油职工大学学报,2004,17(2):39~41.
[3]柳家奎,白全明,陈琰,等.王场背斜构造裂缝性油藏注水开发特征研究[J].石油天然气学报,2005,27(4):480~482.
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