大庆长垣以东地区登二段泥质岩盖层封气能力综合评价

为了使泥质岩盖层评价更具客观性和通用性,在对大庆长垣以东地区登二段泥质岩盖层宏观发育特征和微观封闭能力深入研究的基础上,基于达西定律,提出利用天然气通过泥质岩盖层渗滤速度指数进行盖层封闭性综合评价的方法,并给出各参数的确定方法和评价流程.应用该方法对研究区泥质岩盖层封气能力进行了综合评价,结果表明:在肇深1井-芳深4井-芳深5井-芳深1井-汪9-12井-汪903井一线井区附近及其以西地区,具有好的封气能力.在肇深3井-朝2井-三深1井一线及其南侧和青2井-五深1井-四深1井-川3井等井区,具有中等封气能力.在二深1井-朝深2井-肇深2井南侧,具有差封气能力.在盖层分布的其它地区,具有较好的封气能力.

Comprehensive Evaluation of Gas Sealing Ability of the Lower Denglouku Formation (K1d2) Mudstone Cap-rock in the East of the Daqing Placanticline

In order to get objective and general result of cap-rock sealing ability, the authors put forward to the cap-rock sealing ability comprehensive evaluation method by using the index of permeation velocity of gas through mudstone cap-rock, and give, according to the Darcy law, the method of getting parameters and evaluation process. Based on thoroughly studying the macroscopic characterize and microcosmic sealing ability of the Kid2 mudstone cap-rock in the east of Daqing placanticline. The method has been used to evaluate the gas sealing ability of Kid2 mudstone cap-rock in the east of Daqing placanticline. The result tested in Zhaoshen 1-Fangshen 4-Fangshen 5-Fangshen 1-Wang 9-12-Wang 903 and its west show that the K1d2 mudstone cap-rock has the best sealing ability. In contrast results from the Zhaoshen 3-Chao 2-Sanshen 1 and its south and in Qing 2-Wushen 1-Sishen 1-Chuan 3 show that the K1 d2 mudstone cap-rock has the middle sealing ability. In the south of Ershen 1-Chaoshen 2-Zhaoshen 2, the K1d2 mudstone cap-rock has bad sealing ability. In other areas, the K1d2 mudstone cap-rock has good sealing ability.