低孔低渗气层测井识别与评价方法研究

Research of identifying and evaluating low-porosity and low-permeability gas-layers in well-logging

赵俊峰 纪友亮 陈汉林 蔡蓉

Zhao Junfeng Ji Youliang Chen Hanlin Cai Rong

同济大学海洋与地球科学学院, 上海 200092; 中国石化集团中原石油勘探局测井公司, 河南濮阳 457001

School of Ocean and Earth Science of Tongji University, Shanghai 200092; Well Logging Company, SINOPEC Zhongyuan Oilfield Company, Puyang 457001

为有效地识别和精确地评价以低孔低渗、微裂缝发育为特征的气层, 用岩心资料对应测井资料, 在地质条件约束下, 以细分层的"四性"关系研究为基础, 提出了用直接识别、交会图、数学、综合分析等方法定性识别气层;在对裂缝深入研究的基础上, 建立了储层参数定量解释模型, 并分层位建立了气层识别标准。该气层测井评价方案的投入应用, 提高了测井对气层的识别能力和定量评价精度, 从而为长庆气田的深入勘探与进一步开发提供了科学依据。

In order to effectively identify and accurately evaluate the gas-layers characterized by low- porosity, low-permeability and developing microcracks. On the base of four-characteristic relations' research and using well-logging data are scaled by core data, methods of direct identification, cross plot, mathematics and comprehensive analyzing are put forward to identify gas-layers qualitatively constrained by geological conditions. Based on research of cracks, quantitative interpretation models of reservoir parameters and identification criterion of gas-layers in different strata are put forward. Since the evaluation method has been put into use, the identification capability and evaluation precision of gas-layers in well-logging are improved, which provides scientific bases for further development of Changqing Gasfield.