摘要
针对神木气田主力气藏太原组产水普遍的现象,利用岩心微观分析、水体测试和测井参数交汇法等技术手段,分析水体成因类型、储层孔隙结构特征和气水层的判识标准,从成藏过程的角度,研究气水分布规律。研究表明:(1)气藏水体以CaCl2为主,根据钠氯系数(平均0.63)、氯镁系数(平均64.3)和镁钙系数(0.16),判断水体类型属封闭性较好的古代残余海水;(2)通过深、浅侧向电阻率测井曲线负异常可识别气层和气水层,其电阻率界限为Rt=36.7Ω·m;(3)太原组气藏含水是因为成藏过程中天然气驱替水体的动力不足而形成的储层残留地层水。地层水可划分为气水混合水、孤立透镜状水、致密储层束缚水3种类型。
Aiming at the phenomenon of water production in Taiyuan formation,the main gas reservoir in Shenmu gas field,the genetic type of water body,the pore structure characteristics of reservoir and the criteria for identifying gas and water layers are analyzed by means of core micro analysis,water testing and logging parameter intersecting,and the gas-water distribution law is studied.The results show that:(1) the water body of gas reservoir is mainly CaCl2type.According to the Na-Cl coefficient(average 0.63),Cl-Mg coefficient(average 64.3) and Mg-Ca coefficient(0.16),the water body belongs to the ancient residual seawater with good sealing property.(2) Gas layer and gas-water layer can be distinguished according to the negative anomaly of deep and shallow lateral resistivity logging curve,and their resistivity limit is Rt=36.7 Ω· m.(3) The reason why there is water in Taiyuan Formation gas reservoir is that in the process of reservoir formation,the residual formation water was formed due to the insufficient power of natural gas displacement water body.The formation water can be divided into three types:the mixed water of gas and water,isolated len-shaped water body and the bound water in tight reservoir.
作者
孙建伟
赖雅庭
鲁莎
赵当妮
陈江萌
朱玉杰
SUN Jianwei;LAI Yating;LU Sha;ZHAO Dangni;CHEN Jiangmeng;ZHU Yujie(Second Gas Production Plant,Changing Oilfield Company,Xi'an,Shaanxi 710020,China)
出处
《西安石油大学学报（自然科学版）》
CAS
北大核心
2020年第5期30-37,46,共9页
Journal of Xi’an Shiyou University（Natural Science Edition）
基金
国家科技重大专项“鄂尔多斯盆地大型低渗透岩性地层油气藏开发示范工程”(2016ZX05050)。
关键词
气水判识
水体分布
气藏充注
太原组
神木气田
identification of gas and water
water distribution
gas reservoir charging
Taiyuan Formation
Shenmu Gasfield
