PDC钻头钻井条件下凝灰质储层岩性识别方法

发布时间：2018-08-23 10:02

【摘要】：PDC钻头钻井岩屑粒径小,一般小于2 mm,通过岩屑进行岩性识别面临较大挑战。以东海西湖凹陷某气田上白垩统八角亭组钻遇的一套凝灰质地层为例,通过岩屑薄片鉴定、X-衍射分析、扫描电镜及能谱分析等技术方法组合,建立了凝灰质储层岩性识别方法,识别出了4种主要岩石类型:凝灰岩、晶屑凝灰岩、晶屑-玻屑凝灰岩及凝灰质砂岩,其中凝灰质砂岩储层物性较好。在此基础上,结合岩电特征分析,明确了研究区凝灰质砂岩储层测井响应特征;试采结果证实了凝灰质砂岩为有效储层,从而为东海天然气勘探与开发开辟了新领域。本文探索出的毫米级钻井岩屑凝灰质储层岩性识别方法,对于缺少岩心情况下的复杂岩性识别提供了一种有借鉴价值的技术组合方法,具有一定的推广意义。
[Abstract]:The diameter of cuttings in drilling with PDC bit is small, generally less than 2 mm, so the lithology identification by cuttings is facing a great challenge. Taking a set of tuff strata in a gas field in Xihu sag, East China Sea, as an example, the lithologic identification method of tuff reservoir is established by combining the technical methods such as X-ray diffraction analysis, scanning electron microscope and energy dispersive analysis. Four main types of rock were identified: tuff, vitreous tuff and tuff sandstone, among which the reservoir physical properties of tuff sandstone were better. On this basis, the logging response characteristics of tuffaceous sandstone reservoir in the study area are determined by combining with the analysis of petroelectric characteristics, and the result of production test proves that tuffaceous sandstone is an effective reservoir, thus opening up a new field for natural gas exploration and development in the East China Sea. In this paper, the lithologic identification method of lithologic reservoir in millimeter drilling cuttings tuff reservoir is explored, which provides a valuable technical combination method for complex lithology recognition in the absence of core, and has certain popularization significance.
【作者单位】：中海石油(中国)有限公司上海分公司;中国石油大学(北京);
【基金】：中国海洋石油总公司“十二五”科技重大项目“中国近海低孔低渗油气藏勘探开发关键技术与实践(编号:CNOOC-KJ 125 ZDXM 07LTD)”部分研究成果
【分类号】：P618.13;TE21

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