鄂尔多斯盆地新安边油田长7致密油有效储层识别与甜点优选

Effective reservoir identification and “sweet spot” optimization of Chang 7 tight oil reservoir in Xin'anbian oil field, Ordos Basin

何崇康 成良丙 陈旭峰 孙钿翔 李超 赵国玺

He Chongkang Cheng Liangbing Chen Xufeng Sun Dianxiang Li Chao Zhao Guoxi

中国石油 长庆油田分公司 油田开发处, 西安 710018 2. 中国石油 长庆油田分公司 勘探开发研究院, 西安 710018 3. 低渗透油气田勘探开发国家工程实验室, 西安 710018 4. 中国石油 长庆油田分公司 第二采油厂, 西安 710018 5. 中国石油 长庆油田分公司 第十二采油厂, 西安 710018 6. 中国石油 长庆油田分公司 第六采油厂, 西安 710018

Oil Field Development Office, PetroChina Changqing Oil Field Company, Xi'an, Shaanxi 710018, China 2. Research Institute of Exploration and Development, PetroChina Changqing Oil Field Company, Xi'an, Shaanxi 710018, China 3. National Engineering Laboratory of Low Permeability Oilfield Exploration and Development, Xi'an, Shaanxi 710018, China 4. No.2 Oil Production Plant, PetroChina Changqing Oil Field Company, Xi'an, Shaanxi 710018, China 5. No. 12 Oil Production Plant, PetroChina Changqing Oil Field Company, Xi'an, Shaanxi 710018, China 6. No.6 Oil Production Plant, PetroChina Changqing Oil Field Company, Xi'an, Shaanxi 710018, China

以鄂尔多斯盆地新安边油田长7油藏试油、生产数据为基础，界定在当前技术条件下能够开发的储层为有效储层，从岩心观察、录井显示、储层实验分析、测井响应等4个方面建立有效储层的识别标准。认为现阶段鄂尔多斯盆地能够开发的致密油储层为孔隙度大于5.5%、渗透率大于0.03×10-3 μm2的油斑细砂岩。有效储层恒速压汞显示喉道半径大于0.25 μm，可动流体饱和度大于30%，测井响应声波时差大于215 μs/m。"甜点"区含油性较好，全烃气测录井气测值为基线的3倍以上，电阻率达到30 Ω·m以上。从钻井允许误差和单井控制储量规模分析，最大单油层厚度应大于4 m，压裂后可动用油层厚度达到6 m以上。有利区筛选过程中按照先从沉积相带进行有利区带优选，然后用储层物性、油层厚度下限标准进行"甜点"筛选，在油藏内部产能建设实施过程中按照含油性、邻井实施效果排序，扣除风险区，避免低产低效区。形成的技术指标和技术方法，在新安边地区提交探明储量1.0×108 t，建成了致密油规模开发区块。

We proposed criteria whereby tight oil wells can obtain industrial oil flow under the current technical conditions based on the well test results and dynamic production data for Chang 7 tight oil reservoirs in the Xin'anbian oil field of the Ordos Basin. The criteria were established using core observation, petrophysical logging results, reservoir analysis, and well-logging response. We found that the effective fine sandstone formation has porosity greater than 5.5%, and permeability greater than 0.03×10-3 μm2. Mercury injection experiments under constant rate showed that the channel radius is greater than 0.25 μm, the movable fluid saturation is greater than 30%, and the interval acoustic transit time in well logging is larger than 215 μs/m. In the "sweet spot" zone, oil saturation ishigher, and the measured gas value in well cutting logging is 3 times higher than that of the baseline, and the resistivity is greater than 30 Ω·m. The maximum thickness tolerance for a single oil layer in well drilling should be greater than 4 m, and the thickness of multi-layer oil is more than 6 m. In optimization, favorable zones were firstly selected from the sedimentary facies belt, and then the lower limit criteria of reservoir physical properties and layer thickness to make "sweet spot" zone selection. During development, oil saturation and adjacent well performance were considered for reducing the risk of low yield or low efficiency areas. Through the screening analysis of the technical indicators above, the proven oil reserve is up to 100 million tons in the Xin'anbian oil field.

国家重大科技专项"鄂尔多斯盆地致密油开发示范工程"（2017ZX05069）和中国石油天然气股份有限公司重大科技专项"长庆油田5 000万吨持续高效稳产关键技术研究与应用"（2016E-05）联合资助。

https://doi.org/10.11781/sysydz201706812