摘要
川中古隆起震旦系灯影组优质储层多在丘滩体发育区,储层有效性与缝洞体发育程度和延伸情况有直接关系,常规测井和电成像、阵列声波等测井资料受探测深度的限制,仅能反映井壁附近缝洞发育情况,无法实现井旁缝洞体的精细刻画和评价。理论研究表明,向井旁辐射的声波能量可以被井旁缝洞体或地层界面所形成的声阻抗不连续界面反射回井内并被接收探头所接收,通过对这些反射信号的提取处理,可以评价井旁缝洞体发育程度和延伸情况。通过远探测声波测井信息,运用衰减补偿方法,提取计算反射波能量,结合单井测试资料,建立分类标准,计算单井储层的反射波能量系数。分析表明,反射波能量系数与单井测试产能呈正相关关系,说明利用反射波能量信息,能较好地评价井旁缝洞体发育程度和延伸情况,实现“井壁+井旁”综合评价缝洞型碳酸盐岩储层有效性。该技术方法应用到PT101等特高产井的储层有效性及产能评价中,取得了较好的效果,为西南油气田重点区块勘探取得新突破做出重要贡献。
The Dengying quality reservoirs are mostly distributed in mound-shoal complex in the central Sichuan paleo-uplift,and their effectiveness is directly related to the development and extension of the fracture-vuggy body.Limited to their investigation depth,information of the conventional logging,electric image logging,array acoustic logging can only indicate the development of fractures and vugs near borehole but lack of their fine characterization and evaluation.Theories show that the acoustic wave propagate to the formation can be reflected back into the borehole when meeting the impedance discontinuity interface formed by stratigraphic interface and the frature-vuggy body,and then detected by the tool receiving probes.After processing and analysis of the reflected wave,the development and extension of the near borehole fracture and vugs can be evaluated.In this paper,first basing on remote detection acoustic logging information we obtained the reflected wave amplitude with attenuation compensation method,then combined with single well test productivity,establish a classification criteria to calculate the reflected wave amplitude coefficient.The result shows a positive correlation between the above coefficient and productivity which verified the effectiveness of the method,achieves the borehole circumference comprehensive evaluation.This method has been effectively conformed after tested in extra high production well PT101,which contributes great to the new breakthrough in prospect blocks exploration in Southwest oil and gas fields.
作者
齐宝权
贺洪举
黄宏
刘航
苗清
罗文
QI Baoquan;HE Hongju;HUANG Hong;LIU Hang;MIAO Qing;LUO Wen(Southwest Branch,China National Logging Corporation,Chongqing 400021,China)
出处
《测井技术》
CAS
2022年第6期762-767,共6页
Well Logging Technology
基金
国家科技重大专项“四川盆地大型碳酸盐岩气田开发示范工程”(2016ZX05052)。
关键词
川中古隆起
井旁缝洞体
反射波能量
储层有效性
评价标准
产能评价
central Sichuan paleo-uplift
near borehole fracture-vuggy body
reflected wave amplitude
reservoir effectiveness
evaluation criteria
productivity evaluation
