YB气田大安寨段储层参数计算方法

Parameter calculation for Da′anzhai Member in YB Gas Field

高红贤 冯明刚 王昆 李素兰 周依南

中国石化勘探分公司，四川 成都 610041

SINOPEC Exploration Company, Chengdu 610041, China

川东北YB地区大安寨段为滨浅湖亚相沉积，薄层介壳灰岩与砂泥岩交互形成薄互层，矿物成分复杂、体积分数不一，导致精确计算储层岩石矿物组分及物性参数相当困难。在深入对比分析2种常用测井建模思路的基础上，开展了测井精细解释攻关，形成了利用深侧向电阻率和自然伽马联合计算储层方解石体积分数的计算方法，并利用ECS元素测井计算的方解石体积分数进行精度检验，可以定量计算出岩性，并且分岩性建立了孔隙度计算模型和含气饱和度计算模型。将测井计算出的储层参数与岩心分析资料进行对比表明，测井计算精度较高，适合该区储层参数计算。

Da′anzhai Member belongs to lacustrine facies in YB area, thin coquina (mud-bearing coquina, argillaceous coquina) and sand shale stone form thin interbed. Da′anzhai mineral composition is complex and the contents are various, which largely influence the calculation accuracy of reservoir mineral composition and physical properties. In the paper, based on in-depth comparative analysis of the two common logging model methods, fine log interpretation is studied. The paper concludes a method of calculating lime content with RT and GR and accuracy test with lime content of ECS, thus we can calculate lithology quantitatively; the porosity calculation model and saturation calculation model are built. The comparison of reservoir parameters calculated by logging with those by core analysis shows that this method is accurate and suitable for calculation for this area.

10.6056/dkyqt201506016