基于常规测井的致密砂岩储层体积压裂适应性评价——以吉林油田H井为例

Volume fracturing adaptability evaluation in tight sandstone reservoir by conventional logging——taking well H in Jilin oilfield as an example

体积压裂是现阶段致密砂岩油气藏高效开发的主要手段,体积压裂前对储层适应性做出准确的评价,有利于储层体积压裂改造的成功实施。一般天然裂缝发育、脆性高、两向水平主应力差小的致密砂岩储层具有较好的体积压裂适应性,储层参数的准确获取需要一套完整的室内实验和现场测试数据,考虑到开发成本,大多数油气井都缺乏这套完整的数据。研究表明:通过对常规测井资料的计算分析可准确获取致密砂岩油气藏储层的地质特征,从而可对体积压裂候选层进行适应性评价。以东部一口致密砂岩油井为例,常规测井评价结果显示该井射孔层段具有较强的体积压裂适应性,微地震监测结果显示该井体积压裂后形成以射孔段为中心具有较大规模的复杂裂缝网络体系,与常规测井评价结果吻合,说明该方法评价有效,可为致密砂岩储层体积压裂的选井和选层提供测井依据。

The volume fracturing is the major means of tight sandstone reservoir efficient development at present. It is helpful for the successful implementation to evaluate the volume fracturing adaptability before fracturing. The tight sandstone reservoir with developed natural fracture, high brittleness and low differential horizontal stress has good fracturing adaptability. But it needs a set of complete indoor experiment and field test data to obtain the above parameters. Considering the development cost, most of the oil and gas well lack of these data. The study shows that the accurate tight sandstone reservoir geological characteristics can be obtained by the conventional logging data analysis to evaluate the volume fracturing adaptability. The new method is applied to a tight sandstone oil well in Eastern. The conventional well logging evaluation results show that the perforation interval of the well has strong volume fracturing adaptability. The microseismic monitoring results show that large-scale complex fracture network system centering on the perforated interval is formed after volume fracturing, which is consistent with the well logging evaluation result.The actual applications on the tight sandstone oil wells show that the evaluation results are correct, which can be used in the selection of wells or layers for fracturing.