基于常规测井的致密储层弹性参数预测

Prediction of elastic parameters of tight reservoirs based on conventional logs

余涛 王年明 田文涛 许学良 廖春 尹帅4

中国石油青海油田分公司采油一厂，甘肃 敦煌 736202 中国石油冀东油田分公司工程监督中心，河北 唐山 063200 中国石油测井有限公司青海分公司随钻测井（录井）项目部，甘肃 敦煌 736202 西安石油大学地球科学与工程学院，陕西 西安 710065

No.1 Oil Production Plant, Qinghai Oilfield Company, PetroChina, Dunhuang 736202, China Engineering Supervision Centre, Jidong Oilfield Company, PetroChina, Tangshan 063200, China Logging Department with Drilling of Qinghai, CNPC Logging, Dunhuang 736202, China School of Earth Sciences and Engineering, Xi′an Shiyou University, Xi′an 710065, China

为了提高致密砂岩￣泥页岩互层型储层弹性模量和泊松比的预测精度，文中通过岩石力学及声学测试，提出了一种基于Hoek?鄄Brown准则的岩石弹性模量及泊松比评价方法。该方法适用于常规测井，不需要引入横波时差，可以避免因横波时差可靠性差而引起的误差扩大问题。系统分析了Hoek?鄄Brown准则中各参数与实验获取的岩石力学参数、声学参数的关系。通过区分岩性，建立了基于Hoek?鄄Brown准则的致密砂岩及泥页岩的弹性模量表达方程，弹性模量可由纵波波速求取。由于岩石泊松比与弹性模量具有较好的负相关性，因此，可利用弹性模量对岩石泊松比进行评价。采用该方法预测的岩石弹性模量和泊松比的误差均较小，能够满足工程需要，也验证了该方法的有效性。

In order to improve the prediction accuracy of Young′s modulus and Poisson′s ratio of tight sandstone-shale interbedded reservoirs, using mechanical and acoustic tests, a new assessment system for Young′s modulus and Poisson′s ratio based on the Hoek-Brown criterion was proposed. The method does not require the shear wave time difference; thus, the increase of errors caused by the unreliability of the shear wave time difference can be avoided. This method is suitable for conventional logging series. The relationship between the Hoek-Brown criterion parameters and the rock′s mechanical and acoustic parameters were analyzed systematically. By distinguishing the lithologies, equations for the Young′s moduli of tight sandstones and shales were established based on the Hoek-Brown criteria. The Young′s modulus can be expressed by using only the longitudinal wave velocity. There is a significant negative correlation between Poisson′s ratio and Young′s modulus; therefore, the Poisson′s ratio can be evaluated from the Young′s modulus. The errors of the Young′s modulus and Poisson′s ratio predicted by the proposed assessment method are small, which meet engineering requirements and validate the accuracy of the method.

10.6056/dkyqt201901011