PreviousNext No AccessSEG Integration of Geophysics, Geology, and Engineering Workshop, Chengdu, China, 26–28 June 2023Advances and applications of the CQ-GRI automatic mud logging interpretation systemAuthors: Lei ZhaoJin-Rong LiPing YinRong-Hui YanYin LeiXie TangCong RuanXiao LiangBo LiLei ZhaoCCDC, Geological Exploration and Development Research Institute, Chuanqing Drilling Engineering Co., Ltd., CNPCState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Engineering, Chengdu University of TechnologySearch for more papers by this author, Jin-Rong LiCCDC, Geological Exploration and Development Research Institute, Chuanqing Drilling Engineering Co., Ltd., CNPCSearch for more papers by this author, Ping YinCCDC, Geological Exploration and Development Research Institute, Chuanqing Drilling Engineering Co., Ltd., CNPCSearch for more papers by this author, Rong-Hui YanEngineering and Technology Management Division, Changqing Oilfield Branch, PetroChinaSearch for more papers by this author, Yin LeiEngineering Technology Research Institute of Southwest Oil and Gas Filed CompanySearch for more papers by this author, Xie TangCCDC, Geological Exploration and Development Research Institute, Chuanqing Drilling Engineering Co., Ltd., CNPCSearch for more papers by this author, Cong RuanCCDC, Geological Exploration and Development Research Institute, Chuanqing Drilling Engineering Co., Ltd., CNPCSearch for more papers by this author, Xiao LiangCCDC, Geological Exploration and Development Research Institute, Chuanqing Drilling Engineering Co., Ltd., CNPCSearch for more papers by this author, and Bo LiCCDC, Geological Exploration and Development Research Institute, Chuanqing Drilling Engineering Co., Ltd., CNPCSearch for more papers by this authorhttps://doi.org/10.1190/igge2023-28.1 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InReddit Abstract Mud-Logging is an important data source of the drilling site, which has the characteristics of strong timeliness, long collection time, rich data, and strong comprehensiveness. It is of great significance to drilling construction, decision while drilling, reservoir evaluation, and post-analysis and is known as “the eye of drilling.” At the same time, mud logging is also faced with many problems, such as long parameter acquisition time, different acquisition positions, great influence of human factors, and difficulty in evaluating data quality, etc. It is urgent to study the pretreatment methods of mud logging data, including standardization and automation, to improve the application rate and level. Sichuan logging interpretation and evaluation started relatively late. However, many logging interpretations and evaluation methods have been established for many years, which have achieved good application results in Sichuan, Changqing, Tarim, and other oil and gas regions. However, due to the lack of software system support, the interpretation method is low in integration, poor in systematicness, and low in efficiency, which seriously limits the development of logging interpretation and evaluation. Among them, the pretreatment of logging data depends on manual operation, which seriously restricts the real-time performance of logging interpretation. In addition, there are many logging interpretation methods, which are not systematically integrated and are not upgraded and improved for computers, which further limits the popularization and application of appropriate interpretation methods. Therefore, it is urgent to establish a new logging interpretation and evaluation system software. This paper introduces a software system, “CQ-GRI,” which integrates pretreatment of keylogging parameters, automatic reservoir interpretation, and display output. Because of the high timeliness requirement of rapid evaluation while drilling, the software improves the interpretation efficiency by decomposing and refining the workflow and optimizing the algorithm and realizes one-key preprocessing, one-key interpretation, and one-key mapping. After application in 8 wells, this software’s average efficiency of data processing and interpretation has increased by 92% or more. Keywords: logging, interpretation, algorithmPermalink: https://doi.org/10.1190/igge2023-28.1FiguresReferencesRelatedDetails SEG Integration of Geophysics, Geology, and Engineering Workshop, Chengdu, China, 26–28 June 2023ISSN (online):2159-6832Copyright: 2023 Pages: 142 publication data© 2023 Published in electronic format with permission by the Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished Online: 22 Aug 2023 CITATION INFORMATION Lei Zhao, Jin-Rong Li, Ping Yin, Rong-Hui Yan, Yin Lei, Xie Tang, Cong Ruan, Xiao Liang, and Bo Li, (2023), "Advances and applications of the CQ-GRI automatic mud logging interpretation system," SEG Global Meeting Abstracts : 115-118. https://doi.org/10.1190/igge2023-28.1 Plain-Language Summary KeywordslogginginterpretationalgorithmPDF DownloadLoading ...

一直以来,四川盆地上三叠统须家河组致密气储层的随钻解释多是采用曲线法或交会法,依据特征曲线的纵向变化或交会特征对储层进行判识.这些方法直观、明确、可操作性强,并能够在钻探过程中及时发现储层、划分储层,为致密气勘探提供快捷、有效的储层识别手段.然而,由于该方法中人为因素较大,无法建立定量化的解释标准,随钻解释仍处于定性—半定量阶段.随着四川盆地须家河组致密气勘探、开发的快速推进,单一的储层识别已无法满足随钻地质评价的需求,需要更具指向意义的随钻解释参数为钻井和导向决策提供更有价值的地质信息,以达到提速增效目的.以微钻时与测井声波的相关性为基础,结合钻速方程推导出工程参数对钻时的校正函数,再通过区域数据反演得到函数关系和关键系数,形成了一种随钻孔隙度定量计算方法.该方法为致密气储层孔隙度定量评价的实现提供一种成本低、效率高、效果好的途径,有力支持致密气随钻评价.

井旁构造恢复是一种地质分析手段,通过对地层层位、倾角倾向、断层发育等地质信息的整合和分析,恢复井旁地层和构造特征,旨在为实钻中复杂问题的解决提供关键助力.巫溪地区地处大巴山台缘坳陷带,断褶作用强,地层揉皱和断层发育,该区X井实钻发现龙马溪组底部地层直立、岩性复杂、断裂发育,目标页岩段品质明显变差,下步工程措施难以确定.利用测井、录井及岩心资料落实了井区地层、断层、构造等地质特征,并以地层倾角倾向为基础,结合断层刻画、倒转与重复分析,实现了井旁构造恢复,有效解释了页岩品质变差的原因,为钻井工程施工和区域勘探部署提供了重要依据.

With the popularization and application of fast drilling technology in Sichuan–Chongqing gas provinces, the returned cuttings are fine and even powdered, so the traditional cutting lithology identification methods are not applicable any longer. In this paper, qualitative lithology identification and quantitative interpretation based on element logging were conducted on the key oil and gas bearing layers in this area according to the principle of elemental geochemistry. The study results show that: (1) different lithologies can be identified easily because of their different element logging characteristics. For example, basalts have the element characteristics of 0.35 < Fe/Si < 0.55 and Ca/(Na + K) <4.00, while sedimentary rocks have Fe/Si < 0.35 or >0.55. (2) Clastic rocks, carbonate rocks, sulphate and transition rocks in the category of sedimentary rocks can be identified based on the element combination of (Al + Si + Fe) and (Ca + Mg + S). Among them, clastic rocks have (Al + Si + Fe) >31%, carbonate rocks have (Al + Si + Fe) <8% and (Ca + Mg + S) <36%, and sulphate rocks have (Al + Si + Fe) <5% and (Ca + Mg + S) >36%. (3) Then, based on the element combination of (Si + K + Ca)+Si/Al and (Al + Si + Fe + K)+(Ca + S)/Mg, sandstone, mudstone (shale), gypsum, dolomite, limestone and transition rocks can be identified. Finally, a qualitative identification chart and a set of quantitative interpretation software of element logging on key horizons in Sichuan–Chongqing gas provinces were developed to make this method convenient for field application. This method was applied on site in ten wells (such as Well MX207) in Sichuan–Chongqing gas provinces. It is indicated that the coincidence rate of lithology identification is in the range of 88.75–95.22% (averaging 92.42%). Obviously, it can satisfy the requirements of fast lithology identification while drilling of key oil and gas horizons in Sichuan–Chongqing gas provinces.

安岳气田磨溪区块龙王庙组气藏为目前国内单体规模最大的海相碳酸盐岩整装气田.由于以孔隙(洞)储集层为主,非均质性较强,局部含封存水,随着气藏勘探开发的持续深入,原始封存水多见的边探井、评价井录井气水解释符合率较低,原有录井解释技术难以适应新形势下生产需要,亟需一种更适于新探区、新层系的流体解释技术.围绕录井参数内在联系,通过录井参数优选、数学处理和图板,建立了一种利用钻井液参数结合工程参数识别储集层及其合流体性质的录井解释方法 —— ST流体解释法,并在磨溪构造寒武系龙王庙组开展了大量应用实践.目前,推广应用普及率为89％以上,应用该技术在磨溪区块龙王庙组累计录井解释75口井,解释符合率达86.48％,成效显著,前景广阔.

利用岩心、薄片、测井等资料,对洗象池组储层类型及特征进行研究,研究区储层岩性泥～细晶云岩为主,储集空间类型主要为孔隙和溶蚀孔洞.

元素录井在国内多个油气田已应用多年,有效地解决了PDC钻头、空气钻井等钻井新工艺所造成的常规岩屑录井分昙难题.近年来,随着钻井新工艺在川渝地区的广泛应用,粉末状岩屑导致钻井过程中地层划分困难.通过对川渝地区4口井元素录井获取的资料,建立了曲线趋势法、特征元素比值法、指数法3种地层划分方法.其在川渝地区10口井的应用表明,元素录井分层与测井基本一致,完全满足现场录井要求,解决了该地区钻井新工艺条件下地层划分难题.

在后效录井时,由于受工程的影响,用累积泵冲法可以较准确地计算油气上窜速度和上窜高度,为工程井控提供可靠的依据;测量后效时录井仪要准确采集气测和钻井液参数,收集其它后效特征资料,如槽面显示情况、泥浆流动类型等;根据后效录井时的气测数据、泥浆参数及槽面显示等分析流体性质和流体压力,有利于解释油气水层、指导井控及对已钻油气层的地层原始压力、压力监测等方面进行定性评价.

Upper Triassic Xujiahe Formation in Sichuan Basin has been an important E P stratum for reserves and output increment recently. And western Sichuan area is the important domain for E P of Xujiahe Formation. In this study, the differences existing in the sedimentary facies, stratigraphy, reservoir physical property and reservoir-forming condition of Xujiahe Formation in central and western Sichuan Basin are analyzed based on some previous research. At last, some countermeasures on effective exploration are proposed.