巴中地区千佛崖组致密砂岩储层裂缝与含气性的关系
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摘要
巴中地区千佛崖组储层较薄且致密,不均匀裂缝发育,储层非均质性强。综合利用岩心、测井、地震等资料预测了储层裂缝发育特征及其分布特征,采用AVO技术建立了烃类指示因子DHI并进行目的层含气性分布预测,分别从剖面和平面上对比分析了研究区裂缝分布特征与含气性分布关系。结果表明,巴中地区千佛崖组储层裂缝类型复杂多样、产状多变,发育位置主要为千一段和千二段逆断层上盘构造曲率大的区域;含气性主要分布于千二段中、上亚段,千一段次之;分析裂缝与含气性关系发现,研究区致密砂岩储层中裂缝比较发育的层段含气性明显偏高,裂缝分布与气层分布对应关系好。因此,该地区裂缝分布规律研究对储层预测以及寻找高产气藏具有重要指导意义。
The reservoir of Qianfoya formation in Bazhong area is characterized by thin tight sandstone,diverse fractures,and strong heterogeneity.Based on the core,logging and seismic data,the development and distribution characteristics of fractures in reservoir were analyzed.The hydrocarbon indicator factor DHI was established using AVO to predict gas-bearing ability.The relationship between gas-bearing ability and fractures of tight sandstone reservoir in Qianfoya formation in Bazhong area was analyzed from plane and section.The results showed that the types of fractures in Qianfoya formation in Bazhong area are complex,diverse,and rich in occurrence,the fractures are mainly located in the area with large structural curvature on the upper of the reverse faults in J2q1 and J2q2.Gas is mainly distributed in upper J2q2 submember and middle J2q2 submember,the J2q1 secondly.In the formations with well-developed fractures,the gas-bearing ability is better.Therefore,a better understanding of the distribution laws of fractures will be of great significance to forecasting reservoirs and finding more high-deliverability gas reservoirs.
The reservoir of Qianfoya formation in Bazhong area is characterized by thin tight sandstone,diverse fractures,and strong heterogeneity.Based on the core,logging and seismic data,the development and distribution characteristics of fractures in reservoir were analyzed.The hydrocarbon indicator factor DHI was established using AVO to predict gas-bearing ability.The relationship between gas-bearing ability and fractures of tight sandstone reservoir in Qianfoya formation in Bazhong area was analyzed from plane and section.The results showed that the types of fractures in Qianfoya formation in Bazhong area are complex,diverse,and rich in occurrence,the fractures are mainly located in the area with large structural curvature on the upper of the reverse faults in J2q1 and J2q2.Gas is mainly distributed in upper J2q2 submember and middle J2q2 submember,the J2q1 secondly.In the formations with well-developed fractures,the gas-bearing ability is better.Therefore,a better understanding of the distribution laws of fractures will be of great significance to forecasting reservoirs and finding more high-deliverability gas reservoirs.
引文
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[2]李瑞磊,杨勤林,田建华,等.松辽盆地龙凤山气田致密砂岩含气性预测研究[J].石油物探,2017,56(6):874-881LI R L,YANG Q L,TIAN J H,et al.Tight sandstone gas prediction in the Longfeng Mountain gas field of Songliao Basin,China[J].Geophysical Prospecting for Petroleum,2017,56(6):874-881
[3]邓虎成,周文,周秋媚,等.新场气田须二气藏天然裂缝有效性定量表征方法及应用[J].岩石学报,2013,29(3):1087-1097DENG H C,ZHOU W,ZHOU Q M,et al.Quantification characterization of the valid natural fractures in the2nd Xu Member[J].Acta Petrologica Sinica,2013,29(3):1087-1097
[4]丁文龙,梅永贵,尹帅,等.沁水盆地煤系地层孔-裂隙特征测井反演[J].煤炭科学技术,2015,43(2):53-57DING W L,MEI Y G,YIN S,et al.Logging inversion on pore-crack features of coal measure strata in Qinshui Basin[J].Coal Science and Technology,2015,43(2):53-57
[5] MICHAEL S W,THADDEU S D,VITO F,et al.Potential for deep basin-centered gas accumulation in Hanna Basin,Wyoming[C]//NUCCIO V F,DYMAN T S.Geologic Studies of Basin-centered Gas Systems,Reston,VA:USGS,2001:1-12
[6]赵靖舟,王力,孙兵华,等.鄂尔多斯盆地东部构造演化对上古生界大气田形成的控制作用[J].天然气地球科学,2010,21(6):875-881ZHAO J Z,WANG L,SUN B H,et al.Effect of structural evolution on the formation and distribution of Upper Paleozoic giant gas fields in the east Ordos Basin[J].Natural Gas Geoscience,2010,21(6):875-881
[7]芦慧,鲁雪松,范俊佳,等.裂缝对致密砂岩气成藏富集与高产的控制作用——以库车前陆盆地东部侏罗系迪北气藏为例[J].天然气地球科学,2015,26(6):1047-1056LU H,LU X S,FAN J J,et al.The effects of fractures on gas accumulation and production in tight sandstone:a case of Jurassic DiBei gas reservoir in the east Kuqa Foreland Basin[J].Natural Gas Geoscience,2015,26(6):1047-1056
[8]王鹏威,陈筱,庞雄奇,等.构造裂缝对致密砂岩气成藏过程的控制作用[J].天然气地球科学,2014,25(2):185-191WANG P W,CHEN X,PANG X Q,et al.The controlling of structure fractures on the accumulation of tight sand gas reservoirs[J].Natural Gas Geoscience,2014,25(2):185-191
[9]鲁雪松,赵孟军,刘可禹,等.库车前陆盆地深层高效致密砂岩气藏形成条件与机理[J].石油学报,2018,39(4):365-378LU X S,ZHAO M J,LIU K Y,et al.Forming condition and mechanism of highly effective deep tight sandstone gas reservoir in Kuqa foreland basin[J].Acta Petrolei Sinica,2018,39(4):365-378
[10]邹才能,张国生,杨智,等.非常规油气概念、特征、潜力及技术——兼论非常规油气地质学[J].石油勘探与开发,2013,40(4):385-399ZOU C N,ZHANG G S,YANG Z,et al.Geological concepts,characteristics,resource potential and key techniques of unconventional hydrocarbon:on unconventional petroleum geology[J].Petroleum Exploration and Development,2013,40(4):385-399
[11]王永辉,卢拥军,李永平,等.非常规储层压裂改造技术进展及应用[J].石油学报,2012,33(增刊1):149-158WANG Y H,LU Y J,LI Y P,et al.Progress and application of hydraulie fracturing technology in unconventional reservoir[J].Acta Petrolei Sinica,2012,33(S1):149-158
[12]丁文龙,王兴华,胡秋嘉,等.致密砂岩储层裂缝研究进展[J].地球科学进展,2015,30(7):737-750DING W L,WANG X H,HU Q J,et al.Progress in tight sandstone reservoir fractures research[J].Advances in Earth Science,2015,30(7):737-750
[13]李飞跃,张功成,杨海长,等.复杂断裂综合解释方法在长昌凹陷的应用[J].石油物探,2017,56(4):543-550LI F Y,ZHANG G C,YANG H C,et al.Application of comprehensive interpretation method for complicated fractures in Changchang Sag[J].Geophysical Prospecting for Petroleum,2017,56(4):543-550
[14]杨平,李海银,胡蕾,等.提高裂缝预测精度的解释性处理技术及其应用[J].石油物探,2015,54(6):681-689YANG P,LI H Y,HU L,et al.Interpretative processing techniques and their applications in improving fracture prediction accuracy[J].Geophysical Prospecting for Petroleum,2015,54(6):681-689
[15]丁文龙,尹帅,王兴华,等.致密砂岩气储层裂缝评价方法与表征[J].地学前缘,2015,22(4):173-187DING W L,YIN S,WANG X H,et al.Assessment method and characterization of tight sandstone gas reservoir fractures[J].Earth Science Frontier,2015,22(4):173-187
[16] NARR W.Fracture density in the deep subsurface:techniques with application to Point Arguello Oil Field[J].AAPG Bulletin,1991,75(8):1300-1323
[17] BAHORICH M,FARMER S.3-D seismic discontinuity for faults and stratigraphic features:the coherence cube[J].Expanded Abstracts of 65th Annual Internat SEG Mtg,1995:93-96
[18]刘财,裴思嘉,郭智奇,等.非均匀介质地震AVO响应模拟及分析[J].吉林大学学报(地球科学版),2018,48(5):1512-1521LIU C,PEI S J,GUO Z Q,et al.Seismic AVO simultation and analysis in heterogeneous media[J].Journal of Jilin University(Earth Science Edition),2018,48(5):1512-1521
[19]杨帅,芦俊,杨春.含裂缝致密砂岩多波AVO响应分析[J].石油地球物理勘探,2018,53(4):798-804YANG S,LU J,YANG C.Multi-wave AVO responses in fractured tight sandstone[J].Oil Geophysical Prospecting,2018,53(4):798-804