滨里海盆地东缘构造缝形成期次及低角度构造缝成因
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摘要
裂缝是碳酸盐岩油藏主要的渗流通道,对油田开发具有重要的影响。为揭示低角度构造缝特征及分布,进而实现有效注水开发,基于薄片、岩心和成像测井等资料,综合运用观察法和实验法分析了滨里海盆地东缘北特鲁瓦油田构造缝的发育期次,并结合构造演化历史探讨了研究区低角度构造缝成因。研究结果表明:北特鲁瓦油田共发育了3期构造缝,均以北东—南西走向为主。第1期发育于早二叠纪,以低角度构造缝为主,形成时埋深较浅,充填较早,阴极发光特征以不发光为主,古地应力的最大有效主应力为34. 4 MPa;第2期发育于晚二叠纪,以斜交构造缝为主,少部分被充填,阴极发光特征以昏暗发光和明亮发光为主,古地应力的最大有效主应力为42. 4 MPa;第3期形成于三叠纪,以高角度构造缝为主,几乎未充填,古地应力的最大有效主应力为52. 2 MPa。研究区低角度构造缝主要与构造演化有关,早期的高角度构造缝在地层反转后演变为低角度构造缝。通过对低角度构造缝成因的分析,为北特鲁瓦油田下一步裂缝预测及开发方案部署工作提供了指导。
Fracture is the dominant flow channel for carbonate oil reservoir,which is considered as a crucial element for reservoir development. In order to characterize the low-angle structural fracture and identify its distribution and achieve effective waterflooding development,the core observation and laboratory test were used to analyze the structural fracture development stages of the North Tluwa Oilfield in in the eastern margin of the Caspian Basin based on thin-section,core and imaging logging data. The genesis of structural fracture was also discussed by combining with tectonic evolution history. Research indicates that there are three-stage structural fractures with dominant northeast-southwest strike in the North Tluwa Oilfield. The first-stage structural fractures developed in the Early Permian,which mainly consists of low-angle structural fracture. The fracture development is characterized by shallow buried depth,early filling and non-luminous cathodoluminescence,and the maximum effective principal stress of the paleo-stress is 34.4 MPa. The second-stage structural fractures developed in the Late Permian,which mainly consists of oblique-crossing structural fracture. The fracture development is characterized by small part filling and dim and bright cathodoluminescence,and the maximum effective principal stress of the paleo-stress is 42.4 MPa. The third-stage structural fractures developed in the Triassic,which mainly consists of high-angle structural fracture. The fracture development is characterized by no filling,and the maximum effective principal stress of the paleo-stress is 52.2 MPa. The low-angle structural fracture is mainly related to the tectonic evolution in this region. The early high-angle structural fracture evolved into low-angle structural fracture after stratum inversion. The genesis analysis for the low-angle structural fracture could provide certain guidance for the fracture prediction and development program deployment in the North Tluwa Oilfield.
Fracture is the dominant flow channel for carbonate oil reservoir,which is considered as a crucial element for reservoir development. In order to characterize the low-angle structural fracture and identify its distribution and achieve effective waterflooding development,the core observation and laboratory test were used to analyze the structural fracture development stages of the North Tluwa Oilfield in in the eastern margin of the Caspian Basin based on thin-section,core and imaging logging data. The genesis of structural fracture was also discussed by combining with tectonic evolution history. Research indicates that there are three-stage structural fractures with dominant northeast-southwest strike in the North Tluwa Oilfield. The first-stage structural fractures developed in the Early Permian,which mainly consists of low-angle structural fracture. The fracture development is characterized by shallow buried depth,early filling and non-luminous cathodoluminescence,and the maximum effective principal stress of the paleo-stress is 34.4 MPa. The second-stage structural fractures developed in the Late Permian,which mainly consists of oblique-crossing structural fracture. The fracture development is characterized by small part filling and dim and bright cathodoluminescence,and the maximum effective principal stress of the paleo-stress is 42.4 MPa. The third-stage structural fractures developed in the Triassic,which mainly consists of high-angle structural fracture. The fracture development is characterized by no filling,and the maximum effective principal stress of the paleo-stress is 52.2 MPa. The low-angle structural fracture is mainly related to the tectonic evolution in this region. The early high-angle structural fracture evolved into low-angle structural fracture after stratum inversion. The genesis analysis for the low-angle structural fracture could provide certain guidance for the fracture prediction and development program deployment in the North Tluwa Oilfield.
引文
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[19]倪新锋,杨海军,沈安江,等.塔北地区奥陶系灰岩段裂缝特征及其对岩溶储层的控制[J].石油学报,2010,31(6):933-940.
[20]万青青,刘洛夫,肖飞,等.准噶尔盆地车排子地区下侏罗统八道湾组砂岩储层成岩作用与孔隙演化[J].东北石油大学学报,2017,41(1):21-32.
[21]肖勒.碳酸盐岩岩石学[M].北京:石油工业出版社,2010:1-48.
[22]郝杰,周立发,袁义东,等.断陷湖盆致密砂砾岩储层成岩作用及其对孔隙演化的影响[J].石油实验地质,2018,40(5):632-638.
[23]黎雪,季汉成,王嗣敏,等.太原地区中奥陶世上马家沟组岩溶储层成岩作用及孔隙演化[J].东北石油大学学报,2017,41(6):55-65.
[24]郑荣才.储层裂缝研究的新方法---声发射实验[J].石油与天然气地质,1998,19(3):186-189.
[25]丁原辰,张大伦.声发射抹录不净现象在地应力测量中的应用[J].岩石力学与工程学报,1991,10(4):313.
[2]范存辉,李虎,钟城,等.川东南丁山构造龙马溪组页岩构造裂缝期次及演化模式[J].石油学报,2018,39(4):379-390.
[3]李玉玺,范存辉,李虎,等.川东北元坝中部须家河组构造裂缝形成期次分析[J].西北地质,2018,51(1):265-271.
[4]吴国强,张丽娟,杨振周,等.塔里木盆地哈拉哈塘地区奥陶系储层古岩溶作用及其与裂缝的关系[J].石油实验地质,2017,39(6):790-796.
[5]王鸣川,段太忠,杜秀娟,等.沉积相耦合岩石物理类型的孔隙型碳酸盐岩油藏建模方法[J].石油实验地质,2018,40(2):253-259.
[6]张冲,刘鸿博,姚勇,等.普光气田飞仙关组储集层裂缝特征及期次[J].新疆石油地质,2014,35(5):521-525.
[7]高计县,唐俊伟,张学丰,等.塔北哈拉哈塘地区奥陶系一间房组碳酸盐岩岩心裂缝类型及期次[J].石油学报,2012,33(1):64-73.
[8]范存辉,王时林,袁云峰,等.腰英台地区青山口组裂缝期次及对渗流的影响[J].特种油气藏,2014,21(6):19.
[9]吴永平,昌伦杰,陈文龙,等.裂缝表征及建模在迪那2气田的应用[J].断块油气田,2015,22(1):78-81.
[10]赵向原,胡向阳,肖开华,等.川西彭州地区雷口坡组碳酸盐岩储层裂缝特征及主控因素[J].石油与天然气地质,2018,39(1):30-39.
[11]高金栋,周立发,冯乔,等.储层构造裂缝识别及预测研究进展[J].地质科技情报,2018,37(4):158-166.
[12]周鹏,周露,朱文慧,等.克拉苏构造带超深储层构造主裂缝识别[J].特种油气藏,2018,25(2):42-48.
[13]NELSON R A.geologic analysis of naturally fractured reservoirs(second edition)[M].Houston:Gulf Publishing Company,1985:1-28.
[14]郭凯,程晓东,范乐元,等.滨里海盆地东缘北特鲁瓦地区白云岩特征及其储层发育机制[J].沉积学报,2016,34(4):747-757.
[15]邓西里,汪红,鲍志东,等.滨里海盆地油气分布规律及勘探潜力分析[J].中国石油勘探,2012,17(5):36-47.
[16]石新,程绪彬,汪娟,等.滨里海盆地东缘石炭系KT-Ⅰ油层组白云岩地球化学特征[J].古地理学报,2012,14(6):777-785.
[17]高军,刘雅琴,于京波,等.滨里海盆地东缘中区块盐下构造识别与储层预测[J].石油地球物理勘探,2008,43(增刊1):10-11.
[18]梁爽,郑俊章,张玉攀.滨里海盆地东南缘晚古生代碳酸盐岩台地特征及控制因素[J].地质科技情报,2013,32(3):52-58.
[19]倪新锋,杨海军,沈安江,等.塔北地区奥陶系灰岩段裂缝特征及其对岩溶储层的控制[J].石油学报,2010,31(6):933-940.
[20]万青青,刘洛夫,肖飞,等.准噶尔盆地车排子地区下侏罗统八道湾组砂岩储层成岩作用与孔隙演化[J].东北石油大学学报,2017,41(1):21-32.
[21]肖勒.碳酸盐岩岩石学[M].北京:石油工业出版社,2010:1-48.
[22]郝杰,周立发,袁义东,等.断陷湖盆致密砂砾岩储层成岩作用及其对孔隙演化的影响[J].石油实验地质,2018,40(5):632-638.
[23]黎雪,季汉成,王嗣敏,等.太原地区中奥陶世上马家沟组岩溶储层成岩作用及孔隙演化[J].东北石油大学学报,2017,41(6):55-65.
[24]郑荣才.储层裂缝研究的新方法---声发射实验[J].石油与天然气地质,1998,19(3):186-189.
[25]丁原辰,张大伦.声发射抹录不净现象在地应力测量中的应用[J].岩石力学与工程学报,1991,10(4):313.