鄂尔多斯盆地延长组下组合储层评价与有效开发技术策略
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摘要
鄂尔多斯盆地延长组下组合资源潜力巨大,但储层致密,导致开发效果差,储量难动用。针对此问题,以吴仓堡地区长9储层为切入点,通过大量分析化验数据,应用五元综合分类系数法对下组合储层进行了分类评价,并结合开发数据对有效开发方式进行了分析。结果表明,吴仓堡地区长9储层综合评价系数为3.01,属于低渗透Ⅲ类储层,其他各区块下组合储层均为Ⅲ类或Ⅳ类储层,以Ⅳ类储层为主,应用常规技术难以取得突破,动用难度大。各类开发技术的应用效果对比表明,注水可以有效改善下组合储层的开发效果,且注水时机越早效果越好;水平井开发下组合不但产量高,而且稳产能力优于常规井;应用缝网压裂的开发井其产量约为常规压裂井的2倍;表明"注水+水平井+缝网压裂"的开发技术模式适用于高效开发下组合难动用储量,应大规模推广应用。
In the Ordos Basin,the resources of the lower Yanchang Formation is huge but difficult to be developed and produced,because of the tight reservoir. To solve the problem,we took the Chang 9 reservoir in Wucangbao area as beginning point,based on analyzing a large number of test data,we conducted classified evaluation on the low assemblages by applying the "five yuan synthetic classification coefficient",and got insight into the effective development ways on the basis of development data. Results whoed that the comprehensive evaluation coefficient of Chang 9 reservoir in the area was 3. 01 and the reservoir belonged to low-permeability Class III reservoir,while other assemblages of other blocks were Class III or Class IV ones,which were dominated by Class IV ones. Conventional technology is difficult to make breakthrough and hard to be used for producing. Comparison of the application of all development technologies revealed that water injection could effectively improve development effect of low assemblages. The earlier we injected water,the better the result was. Horizontal well development could not only reach high yield,but could keep more stable production compared with conventional wells. The production of the wells with fracture network fracturing doubled that of the wells with traditional fracturing. It was indicated that the development mode of"water injection+horizontal well development+fracture network fracturing"was applicable for the reserves difficult to be produced in low assemblages and deserved large-scale application.
In the Ordos Basin,the resources of the lower Yanchang Formation is huge but difficult to be developed and produced,because of the tight reservoir. To solve the problem,we took the Chang 9 reservoir in Wucangbao area as beginning point,based on analyzing a large number of test data,we conducted classified evaluation on the low assemblages by applying the "five yuan synthetic classification coefficient",and got insight into the effective development ways on the basis of development data. Results whoed that the comprehensive evaluation coefficient of Chang 9 reservoir in the area was 3. 01 and the reservoir belonged to low-permeability Class III reservoir,while other assemblages of other blocks were Class III or Class IV ones,which were dominated by Class IV ones. Conventional technology is difficult to make breakthrough and hard to be used for producing. Comparison of the application of all development technologies revealed that water injection could effectively improve development effect of low assemblages. The earlier we injected water,the better the result was. Horizontal well development could not only reach high yield,but could keep more stable production compared with conventional wells. The production of the wells with fracture network fracturing doubled that of the wells with traditional fracturing. It was indicated that the development mode of"water injection+horizontal well development+fracture network fracturing"was applicable for the reserves difficult to be produced in low assemblages and deserved large-scale application.
引文
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[10]陈永胜,赵虹,郑小杰,等.鄂尔多斯盆地志丹探区延长组储层特征研究及评价[J].西北地质,2009,42(2):83-88.
[11]李世昌,文志刚,张雅楠,等.葫芦河地区长71储层特征及评价[J].石油天然气学报,2014,36(11):48-51.
[12]淡卫东,牛小兵,梁晓伟,等.鄂尔多斯盆地延长组大型低渗透岩性油藏储层综合评价[J].低渗透油气藏,2012,35(3):20-25.
[2]宋和平,张炜.鄂尔多斯盆地下寺湾地区三叠系下组合地层石油地质特征及勘探方向[J].西北地质,2011,44(4):122-131.
[3]谢正义,郭占林,刘志延,等.志丹地区延长组下组合勘探有利区预测[J].延安大学学报(自然科学版),2012,31(1):62-65.
[4]王变阳,贺永红,王康乐,等.鄂尔多斯盆地定边—安塞地区延长组下组合储层特征[J].岩性油气藏,2014,26(6):64-68.
[5]焦姣,杨金华,田洪亮.致密油地质特征及开发特性[J].非常规油气,2015,2(1):71-75.
[6]庞皓,房国庆,于航等.英东油田油砂山组储层特征研究及分类评价[J].非常规油气,2015,2(4):19-29.
[7]王瑞飞,陈明强,孙卫.鄂尔多斯盆地延长组超低渗透砂岩储层微观孔隙结构特征研究[J].石油钻采工艺,2008,54(2):270-277.
[8]王瑞飞,沈平平,宋子齐,等.特低渗透砂岩油藏储层微观孔喉特征[J].石油学报,2009,30(4):560-563.
[9]赵靖舟,吴少波,武富礼.论低渗透储层的分类与评价标准——以鄂尔多斯盆地为例[J].岩性油气藏,2007,19(3):28-31.
[10]陈永胜,赵虹,郑小杰,等.鄂尔多斯盆地志丹探区延长组储层特征研究及评价[J].西北地质,2009,42(2):83-88.
[11]李世昌,文志刚,张雅楠,等.葫芦河地区长71储层特征及评价[J].石油天然气学报,2014,36(11):48-51.
[12]淡卫东,牛小兵,梁晓伟,等.鄂尔多斯盆地延长组大型低渗透岩性油藏储层综合评价[J].低渗透油气藏,2012,35(3):20-25.