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压裂施工曲线应用于深层页岩气水平井裂缝评价

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页岩气水平井通常没有取芯、电成像等资料,增加了裂缝识别难度,而压裂施工曲线能较好地反映出压裂效果和压前天然裂缝的发育情况.以川南泸州Y101区块深层页岩气地层为例,根据携砂液阶段压裂施工曲线类型及特征刻度水平井压前裂缝层段、基质层段的测井响应特征,利用小波变换提取反映裂缝信息的高频微弱信号建立小波变换综合系数(WI)、交会图优选6项对裂缝响应敏感的参数指标、层次分析法与模糊数学法构建裂缝评价综合系数(FI),并进一步结合不同压裂施工曲线类型与测井信息的关系,实现了水平井裂缝层段识别及发育级别评价.研究结果表明,携砂液阶段压裂施工曲线形态有下降型(Ⅰ)、下降稳定型(Ⅱ)、稳定型(Ⅲ)及上升型(Ⅳ)4种类型,其中,当自然伽马高值、补偿中子和密度明显增大、声波时差增大伴"锯齿状"周波跳跃、双侧向呈"正差异"且WI≥0.18,FI≥0.430时,压裂施工曲线为下降型,裂缝发育好(F—A级);0.390≤FI＜0.430时,既有下降型又有下降稳定型,裂缝较发育(F—B级);0.350≤FI＜0.390时,为下降稳定型,裂缝一般发育(F—C级).
Application of Fracturing Construction Curve in Fracture Evaluation of Deep Shale Gas Horizontal Wells
Shale gas horizontal wells usually do not have coring and electrical imaging scales,which makes it difficult to iden-tify fractures.The fracturing operation curve can reflect the fracturing effect and the development of natural fractures before fracturing.Taking the deep shale gas formation of Block Y101 in Luzhou,southern Sichuan as an example,according to the type and characteristics of the fracturing operation curve in the sand-carrying fluid stage,the logging response characteristics of the fracture layer and the matrix layer before the fracturing of the horizontal well are calibrated.The wavelet transform is used to extract the high-frequency weak signal reflecting the fracture information to establish the wavelet comprehensive coefficient(WI),the crossplot is used to select six parameter indexes sensitive to the fracture response,the analytic hierarchy process and the fuzzy mathematics method are used to construct the fracture evaluation comprehensive coefficient(FI),and the relationship between different fracturing operation curve types and logging information is further combined to realize the identification and development level evaluation of horizontal well fracture layers.The results show that the fracturing construc-tion curve of the sand-carrying fluid stage has a descending type(Ⅰ),a descending stable type(Ⅱ),a stable type(Ⅲ),and an ascending type(Ⅳ).Among them,when the natural gamma high value,the compensated neutron and the density increase sig-nificantly,the acoustic time difference increases with the"jagged"cycle jump,the double lateral shows a"positive difference"and WI≥0.18,FI ≥0.430,the fracturing construction curve is a descending type,and the fracture is well developed(F-A grade);When 0.390≤FI＜0.430,there are both downward type and downward stable type,and the fractures are more developed(F-B grade);when 0.350≤FI＜0.390,it is a descending stable type,and the fractures are generally developed(F-C grade).

deep shale gashorizontal wellfracturing operation curvefracture evaluationlogging information

闫建平、来思俣、郭伟、廖茂杰、黄毅

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西南石油大学地球科学与技术学院,四川成都 610500

天然气地质四川省重点实验室,四川成都 610500

油气藏地质及开发工程全国重点实验室·西南石油大学,四川 成都 610500

中国石油勘探开发研究院,北京海淀 100083

中国石油西南油气田公司页岩气研究院,四川成都 610000

中国石油集团测井有限公司西南分公司,重庆渝北 400021

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深层页岩气 水平井 压裂施工曲线 裂缝评价 测井信息

国家自然科学基金中国石油-西南石油大学创新联合体科技合作项目四川省自然科学基金高等学校学科创新引智计划(111计划)中国石油科技部"十四五"重大专项

423721772020CX0200002022NSFSC0287D180162021DJ1901

2024

10.11885/j.issn.1674-5086.2022.10.18.04

西南石油大学学报(自然科学版)
西南石油大学

西南石油大学学报(自然科学版)

CSTPCD北大核心
影响因子：1.226
ISSN：1674-5086
年,卷(期)：2024.46(5)