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鄂尔多斯盆地上古生界正、反韵律砂体与裂缝组合的含气性测井解释方法探讨
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摘要
本文在区域地质资料的基础上,结合岩心、录井、测井、测试等资料对鄂尔多斯盆地上古生界正、反韵律砂体与裂缝不同组合的含气地质模型及测井解释方法进行了探讨。取得的主要认识如下:
     (1)依据正、反韵律砂体与裂缝的组合关系将砂体分为四种主要类型:平行层面缝、低角度斜向缝发育而近垂直缝不发育的正韵律砂体;平行层面缝、低角度斜向缝和近垂直缝发育的正韵律砂体;平行层面缝、低角度斜向缝发育而近垂直缝不发育的反韵律砂体;平行层面缝、低角度斜向缝和近垂直缝发育的反韵律砂体。
     在近垂直裂缝不发育的正韵律砂体中,韵律下部的砂体是含气的有利部位。在近垂直裂缝发育的正韵律砂体中,韵律上部的砂体是含气的有利部位。在反韵律砂体中,无论近垂直裂缝发育与否,韵律顶部的砂体均为有利含气部位。
     (2)针对上古生界裂缝发育的正、反韵律砂岩储层,以下方法可提高气层解释的成功率。首先进行砂体韵律的解释,常规测井的自然伽马曲线形态对砂体韵律的响应最为敏感。其次进行裂缝的解释,成像测井可以准确识别裂缝,低角度裂缝通常以暗色正弦曲线的方式展布在成像图像上,近垂直裂缝则会表现为与井轴夹角很小甚至平行的暗色线条。在缺乏成像测井资料时,通过优选对裂缝响应灵敏的常规测井参数和建立交会图解释模板,可以达到对裂缝较为准确的识别。在以上研究的基础上,结合常规气层识别方法对正、反韵律砂体的含气性进行综合解释。
     (3)按照以上方法,对该区23口井32个砂岩储层段的含气性进行了解释,解释结果与试气成果吻合关系良好,证明该方法是可行的。
In this thesis, the author researches the gas bearing geologic model and log interpretation method of the different combination of positive rhythm, inverted rhythm sand body and fractures of Neopaleozoic in Ordos Basin by using core, well log, test data on base of regional geology knowledge. The main viewpoints are as following:
     (1) Sand body can be divided into four classes according to the combination relationship between positive rhythm, inverted rhythm sand body and fractures:positive rhythm sand body with developed plane-parallel fractures, low-angle declinate fractures and undeveloped subvertical fractures; positive rhythm sand body with developed plane-parallel fractures, low-angle declinate fractures and subvertical fractures; inverted rhythm sand body with developed plane-parallel fractures, low-angle declinate fractures and undeveloped subvertical fractures; inverted rhythm sand body with developed plane-parallel fractures, low-angle declinate fractures and subvertical fractures.
     (2) For the positive rhythm and inverted rhythm sandstone reservoir with developed fractures of Neopaleozoic, the falling means can enhance the success rate of gas zone interpretation. First of all, to interpret sand body rhythm. The shape of gamma ray curve of conventional log is the most sensible to sand body rhythm. Secondly, to interpret fractures. Imagery log can identify fractures accurately. Low angle fractures usually distribute on imagery log in the form of dark colored harmonic curve and subvertical fractures manifest dark colored line with small included angle or parallel against hole axis. When imagery log data are absent, fractures can be identified correctly by optimizing conventional log parameters which are sensible to fracture response and establishing interpretation model of cross plot. On base of the forgoing research, to interpret the gas bearing character of positive rhythm and inverted rhythm sand body comprehensively uniting conventional gas zone interpretation methods.
     (3) According to the foregoing method, the gas bearing character of 32 sandstone reservoir of 23 wells in this area had been interpreted. The interpretation result coincides well with trial production outcome, which demonstrates the feasibility of this method.
引文
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