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深层含沥青白云岩储层岩石物理特征与测井评价方法
Petrophysical characteristics of deep dolomite reservoirs with bitumen and well-logging evaluation methods
王跃祥1 谢 冰1 赖 强1 何绪全1 杨 满2 赵艾琳1  彭 骁1 韩 冰1 白 利1
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作者单位:1. 中国石油西南油气田公司勘探开发研究院 2. 斯伦贝谢有限公司
中文关键字:川西地区 观雾山组 含沥青储层 非均质性 岩石物理实验 沥青评价
英文关键字:Western Sichuan Basin; Guanwushan Formation; Bitumen-bearing reservoir; Heterogeneity; Petrophysical experiment; Bitumen evaluation
中文摘要:    近年在川西地区泥盆系观雾山组见到了较好的储层分布,多口井获得工业气流。然而,川西观雾山组岩心缝洞中沥青充填严重,储层沥青含量和储层参数定量计算难度大。为此,从沥青对观雾山组储层定量影响分析入手,通过高温循环沥青溶解实验建立沥青溶解前后的孔隙度—声波时差、孔隙度—电阻率模型,采用纵波时差—横波时差、声波时差—电阻率等模型定量计算沥青含量,进而得到沥青校正后的储层参数。结果表明:①沥青占据着储集层的部分储集空间,不仅减小储集层的孔隙度,还大大降低储集层的渗透性,严重影响了储集层的物性及产能;②通过沥青对各类测井参数影响分析发现,沥青对储集层物性、岩样密度、声波时差以及电阻率均具有一定的影响,并且随着沥青含量的增多,影响越大,尤其是横波时差和电阻率;③经岩心资料验证,经沥青校正后测井评价结果可靠,效果较好,可有效指导测井采集系列优化及试气选层,为气藏井位部署提供依据。
英文摘要:    In recent years, better reservoir distribution has been discovered in the Devonian Guanwushan Formation, western Sichuan Basin, and industrial gas flow has been produced from a lot of wells. However, it is difficult to quantitatively calculate bitumen content and reservoir parameters of Guanwushan Formation because of serious bitumen filling in both fractures and vugs. To this end, the influence of bitumen on Guanwushan reservoirs was analyzed quantitatively. Then, both porosity-sonic time difference and porosity- resistivity models before and after bitumen dissolution were established through some high-temperature cyclic bitumen dissolution experiments. Finally, the bitumen content was quantitatively calculated by means of compressional wave time difference-shear wave ts show that (1) bitumen occupies some reservoir space, which may reduce not only porosity but also permeability a lot, so as to seriously impact on physical properties and productivity; (2) some analysis on bitumen affecting various well-logging parameters indicates a certain impact on the physical properties, rock sample density, sonic time difference, and resistivity. And this impact may increases with the increase of bitumen content, especially shear wave time difference and resistivity; and (3) core analysis data verifies that the well-logging evaluation result after bitumen correction is reliable and the evaluation effect is better, which can effectively guide to optimizing well-logging acquisition and selecting gas testing layers and provide the basis for well-location deployment.
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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
主管单位:中国石油西南油气田公司  主办单位:中国石油西南油气田公司勘探开发研究院
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