PDC钻头钻井条件下凝灰质储层岩性识别方法  

Lithology identification method of tuffaceous reservoir under PDC bit drilling condition

作　　者：黄导武 何贤科 程俊阳 朱毅秀[2] 

机构地区：[1]中海石油(中国)有限公司上海分公司,上海200335 [2]中国石油大学(北京),北京102249

出　　处：《中国海上油气》2017年第5期56-61,共6页China Offshore Oil and Gas

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

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。Drilling cuttings of PDC bit are generally less than 2 mm of diameter, which causes big challenge for lithology identification. Taking tuffaceous strata of Upper Cretaceous Bajiaoting Formation in a gas field in Xihu sag, the East China Sea as an example, the lithology identification method is established by combing cutting thin sections observation , X-ray diffraction analysis , scanning electron microscopy and en-ergy dispersive spectrometer analysis, and 4 main lithology types are identified： tuff, crystal tuff, crystal- glass tuff and tuffaceous sandstone, in which the tuffaceous sandstone reservoir has good properties. Com-bined with analysis of lithology and electrical properties, the logging response characteristics of tuffaceous sandstone reservoir in the study area are clarified. The effective tuffaceous sandstone reservoir is confirmed by production test, which opens a new area of natural gas exploration and development in the East China Sea. The lithology identification method of tuffaceous reservoir based on millimeter scale drilling cuttings provides a technical combination for the complex lithological identification without core and has certain popularization significance.

关 键 词：PDC钻头 钻井岩屑 凝灰质储层 岩性识别 西湖凹陷 东海 

分 类 号：TE142[石油与天然气工程—油气勘探]