渝东南地区下三叠统飞二段—飞三段鲕滩分布特征

doi:10.19657/j.geoscience.1000-8527.2022.100

现代地质 ›› 2023, Vol. 37 ›› Issue (05): 1208-1220.DOI: 10.19657/j.geoscience.1000-8527.2022.100

渝东南地区下三叠统飞二段—飞三段鲕滩分布特征

赵玲丽¹(), 宋金民¹^,²(), 袁海锋¹^,², 徐国盛¹^,², 邓双林³, 赵聪⁴, 金鑫¹, 李立基¹, 李朋武³, 任佳鑫¹, 李柯然¹, 冯宇翔¹, 范建平¹

1.成都理工大学能源学院,四川成都 610059
2.油气藏地质及开发工程全国重点实验室(成都理工大学),四川成都 610059
3.中国石油化工股份有限公司西南油气分公司,四川成都 610095
4.成都理工大学产业技术学院,四川宜宾 644000

收稿日期:2022-04-24 修回日期:2022-12-30 出版日期:2023-10-10 发布日期:2023-11-14
通讯作者: 宋金民,男,博士,副教授,硕士生导师,1983年出生,矿产普查与勘探专业,主要从事碳酸盐岩沉积储层研究。 Email:songjinmin@sohu.com。
作者简介:赵玲丽,女,硕士研究生,1998年出生,地质资源与地质工程专业,主要从事碳酸盐岩沉积储层研究。 Email:2272080610@qq.com。
基金资助:
国家自然科学基金项目“川西地区深层雷口坡组微生物岩及其储层形成机理研究”(41872150);四川省科技厅重点研发项目(2018JZ0078)

Distribution Characteristics of Oolitic Beach in the 2^nd and 3^rd Members of Lower Triassic Feixianguan Formation, Southeastern Chongqing

ZHAO Lingli¹(), SONG Jinmin¹^,²(), YUAN Haifeng¹^,², XU Guaosheng¹^,², DENG Shuanglin³, ZHAO Cong⁴, JIN Xin¹, LI Liji¹, LI Pengwu³, REN Jiaxin¹, LI Keran¹, FENG Yuxiang¹, FAN Jianping¹

1. School of Energy, Chengdu University of Technology, Chengdu, Sichuan 610059, China
2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Chengdu University of Technology), Chengdu, Sichuan 610059, China
3. PetroChina Southwest Oil and Gas Company, Chengdu, Sichuan 610095, China
4. College of Industrial Technology, Chengdu University of Technology, Yibin, Sichuan 644000, China

Received:2022-04-24 Revised:2022-12-30 Online:2023-10-10 Published:2023-11-14

摘要/Abstract

摘要：

通过野外剖面实测、薄片鉴定、测井数据和地震资料分析,基于岩性-电性标志建立了渝东南地区飞仙关组地层四分的划分方案,并探讨了新方案下飞二段和飞三段的鲕滩分布规律。研究结果表明:飞一段以灰岩和泥灰岩为主,自然伽马(GR)值为80~105 API,电阻率为75~200 Ω·m;飞二段以泥晶灰岩和残余砂屑鲕粒白云质(含云)灰岩为主,GR值较飞一段降低至11~31 API,电阻率值较飞一段增高至200~4205 Ω·m;飞三段以鲕粒灰岩、砂屑灰岩为主,测井数值较飞二段变化不大,仅在飞三段顶、底部可见局部高GR值;飞四段发育泥质白云岩和泥质灰岩,GR值较飞三段增高至35~66 API,电阻率值降低至74~280 Ω·m。在此基础上,明确飞二段滩体发育在渠县—梁平以及丰都—忠县—利川一带,飞三段滩体主要围绕垫江—梁平滩间洼地呈环带状发育,飞三段较飞二段发育的颗粒滩体厚度大、展布范围广、规模大、连通性强。研究区飞仙关期沉积模式为镶边碳酸盐岩台地,明确分层方案后认为伴随飞三期海退,台内滩体中心向东迁移。

关键词: 渝东南, 下三叠统, 飞仙关组, 地层划分, 鲕滩

Abstract:

The Feixianguan Formation (FXGF) subdivision in southeastern Chongqing is established based on the lithologic-electrical identification mark by the outcrop measurement, thin-section microscopic observation, logging data and seismic data analysis.The distribution patterns of oolitic beach in the 2^nd and 3^rd members of FXGF are discussed.The results show that the stratigraphic framework of FXGF in southeastern Chongqing can be divided into four parts.The FXGF 1^st Member is mainly composed of limestone with the characteristics of 80~105 API GR value and 75~200 Ω·m LLD value.The FXGF 2^nd Member is mainly composed of micritic limestone and silty oolitic limestone.The GR value reduced to 11~31 API, and the resistivity value increased to 200~4205 Ω· m compared with the FXGF 2^nd Member.While the FXGF 3^rd Member is mainly composed of oolitic limestone and silty limestone.The logging value has little change compared with the FXGF 2^nd Member.Only the top and bottom of the FXGF 3^rd Member can be seen with high GR value.Argillaceous dolomite and argillaceous limestone are developed in the FXGF 4^th Member with GR value increasing to 35~66 API and resistivity decreasing to 74~280 Ω·m (compared with the FXGF 3^rd Member).In the study area, oolitic beach in the FXGF 2^nd Member is developed in Quxian-Liangping and Fengdu-Zhongxian-Lichuan areas.Oolitic beaches of the FXGF 3^rd Member were mainly developed around the Dianjiang-Liangping intertidal depression, which were distributed in a ring belt.The oolitic beach developed in the FXGF 3^rd Member is thicker, more connectivity, more widely distributed, and larger in scale than that in the FXGF 2^nd Member.The local sedimentary model during Feixianguan period is a rimmed carbonate platform.After clarifying the stratification scheme, we considered that the beach center in the platform migrated eastward with the regression during the 3^rd Member of Feixianguan period.

Key words: Southeast Chongqing, Lower Triassic, Feixianguan Formation, stratigraphic division, oolitic beach

中图分类号:

赵玲丽, 宋金民, 袁海锋, 徐国盛, 邓双林, 赵聪, 金鑫, 李立基, 李朋武, 任佳鑫, 李柯然, 冯宇翔, 范建平. 渝东南地区下三叠统飞二段—飞三段鲕滩分布特征[J]. 现代地质, 2023, 37(05): 1208-1220.

ZHAO Lingli, SONG Jinmin, YUAN Haifeng, XU Guaosheng, DENG Shuanglin, ZHAO Cong, JIN Xin, LI Liji, LI Pengwu, REN Jiaxin, LI Keran, FENG Yuxiang, FAN Jianping. Distribution Characteristics of Oolitic Beach in the 2^nd and 3^rd Members of Lower Triassic Feixianguan Formation, Southeastern Chongqing[J]. Geoscience, 2023, 37(05): 1208-1220.

图/表 12

图1 渝东南地区飞一段沉积相及晚二叠世基底断裂平面图(据文献[17?-19]修改) F1.七跃山断裂;F2.万县—长寿断裂;F3.大竹—梁平断裂;F4.南充—涪陵断裂;F5.黄泥堂断裂;F6.明月峡断裂;F7.铜锣峡断裂;F8.华蓥山断裂

Fig.1 Sedimentary facies of the 1st member of Feixianguan Formation in southeastern Chongqing(modified from refs.[17?-19])

图2 渝东南地区龚家垭口飞仙关组综合柱状图

Fig.2 Comprehensive column of Feixianguan Formation, Gongjiayakou section in southeastern Chongqing

图3 渝东南地区龚家垭口剖面飞仙关组各段岩石学特征 (a) 浅灰色中层状含泥泥晶灰岩,第6层,飞一段;(b) 灰色中层状亮晶砂屑灰岩,第20层,飞二段;(c) 浅灰白色极薄层状钙质泥岩,第71层,飞四段;(d) 残余砂屑鲕粒白云质灰岩,飞二段,铸体薄片茜素红染色,×5,单偏光;(e) 残余亮晶鲕粒灰岩,飞三段,铸体薄片茜素红染色,×5,单偏光;(f) 泥晶砾屑灰岩,飞四段,铸体薄片茜素红染色,×5,单偏光

Fig.3 Petrological characteristics of Feixianguan Formation in Gongjiayakou section, southeastern Chongqing

表1 渝东南地区飞仙关组各段岩性与测井响应的四分特征

Table 1 Lithology and logging response characteristics of each member of Feixianguan Formation in southeasternChongqing

段	岩性	GR(API)			RD (Ω·m)		DEN (g·cm^-3)
段	岩性	形态	范围	平均值	范围	平均值	范围	平均值
飞四段	砂屑灰岩、泥晶灰岩、泥灰(云)岩	锯齿状	35~66	44.65	74~280	183	2.60~3.00	2.80
飞三段	砂屑鲕粒灰岩	近似平直	7~30	17.56	626~5717	3624	2.40~3.00	2.70
飞二段	砂屑灰岩、泥晶灰岩	近似平直	11~31	22.80	200~4205	2604	2.70~2.80	2.70
飞一段	泥灰岩	锯齿状	80~105	92.70	75~200	144	2.60~2.80	2.70

图4 渝东南邻北1井-苟西1井-池54井-洋渡3井-峰12井飞仙关组连井对比图

Fig.4 Comparison of connecting wells in Feixianguan Formation of well Linbei 1-well Gouxi 1-well Chi 54-well Yangdu 3- well Feng 12, southeastern Chongqing

图5 渝东南地区飞仙关组井震剖面(a)与各段地震合成记录(b)(参数单位:MD,in.;DT,μs/m;GR,API;TWT,ms;其他为无量纲) (a)苟西1井、洋渡3井和峰12井合成地震记录;(b)渝东南地区地震地层对比时间二维偏移剖面

Fig.5 Well seismic profiles (a) seismic synthetic records (b) and of each member of Feixianguan Formation in southeasternChongqing

图6 渝东南地区池54井池55井池13井-峰11井-峰12井鲕滩连井分布图

Fig.6 Oolitic beach distribution of well Chi54 - well Chi55 - well Chi13 - well Fengl1 - well Feng12 in southeastern Chongqing

图7 渝东南地区邻北1井-苟2井-池54井-洋渡3井鲕滩连井分布图

Fig.7 Oolitic beach distribution of well Linbei 1-well Gou 2-well Chi54- well Yangdu 3 in southeastern Chongqing

图8 渝东南地区飞二段鲕滩分布图(据文献[21]修改)

Fig.8 Distribution of oolitic beach of the 2nd member of Feixianguan Formation in southeastern Chongqing

图9 渝东南地区飞三段鲕滩和滩间洼地镜下微观特征 (a) 砂屑鲕粒灰岩,池42井,飞三段,2719.2 m;(b) 砂屑鲕粒灰岩,峰007-2井,飞三段,3839.66 m;(c) 亮晶鲕粒灰岩,池42井,飞三段,2720.8 m,×2.5,单偏光;(d) 亮晶鲕粒灰岩,峰15井,3859.7 m,×5,单偏光;(e) 残余亮晶鲕粒白云质灰岩,茜素红染色,梁7井,飞三段,3971 m,×5,单偏光;(f) 泥质泥晶灰岩,茜素红染色,梁7井,飞三段,3971 m,×5,正交光

Fig.9 Microscopic characteristics of oolitic beach and interbank depression in the 3rd member of Feixianguan Formation, southeastern Chongqing

图10 渝东南地区飞三段沉积相与地震相特征 (a)渝东南地区飞三段鲕滩平面分布图(鲕滩边界依据鲕地比,据文献[21]修改);(b)二维时间偏移剖面AA’; (c)二维时间偏移剖面BB’

Fig.10 Characteristics of sedimentary facies and seismic facies in the 3rd member of Feixianguan Formation, southeastern Chongqing

图11 渝东南地区飞二段与飞三段鲕滩发育模式

Fig.11 Sedimentary facies model of Feixianguan Formation in southeastern Chongqing

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渝东南地区下三叠统飞二段—飞三段鲕滩分布特征

Distribution Characteristics of Oolitic Beach in the 2^nd and 3^rd Members of Lower Triassic Feixianguan Formation, Southeastern Chongqing

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渝东南地区下三叠统飞二段—飞三段鲕滩分布特征

Distribution Characteristics of Oolitic Beach in the 2nd and 3rd Members of Lower Triassic Feixianguan Formation, Southeastern Chongqing

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Distribution Characteristics of Oolitic Beach in the 2^nd and 3^rd Members of Lower Triassic Feixianguan Formation, Southeastern Chongqing