湖北兴山峡口中下三叠统岩石学一沉积环境分析*

南京大学学报(自然科学版) ›› 2013, Vol. 49 ›› Issue (3): 343–355.

湖北兴山峡口中下三叠统岩石学一沉积环境分析*

张震1.2**，鲍志东3，胡广成4

出版日期:2015-11-12 发布日期:2015-11-12
作者简介: (1.中国地质科学院矿产资源研究所，北京，100037;2.国上资源部盐湖资源与环境重点实验室，北京，100037;
3.中国石油大学(北京)油气资源与探测国家重点实验室，北京，102249;4.中国石油勘探开发研究院，北京，100083)
基金资助:
中国石化海相前瞻性项日“中国南力海相地层定量岩相古地理研究及油气预测”(C一0800-06-ZS-349)

Petrology and sedimentary environments of the Lower and Middle
Triassic of the Xiakou section in Xingshan County，Hubei Province

Zhang Zhen1.2，Bao Zhi Dong3，Hu Guang-Cheng4

Online:2015-11-12 Published:2015-11-12
About author: (1 .Institute of Mineral Resources,Chinese Academy of Geological Sciences，Beijing, 100037 , China;
2. Key Laboratory of Saline Lake Resources and Environments, Ministry of Land and Resources,Beijing, 100037,China;
3. State Key Laboratory of Petroleum Resource and Prospecting,China University of Petrolcum,Bcijing, 102249,China;
4. Research institute of Petroleum Exploration and Devclopment,Petro China,Bcijing, 100083,China)

摘要/Abstract

摘要： 湖北兴山峡口剖面中、下三叠统发育齐全，化石丰富，沉积标志可靠，出露良好，是研究上扬子地
区海相地层的理想剖面之一根据地层划分与对比，自下而上可分为下三叠统大冶组、嘉陵江组和中三叠
统巴东组，总厚度1218 m.该剖面以石灰岩为主，其次为白云岩，含少量岩溶角砾岩及碎屑岩.石灰岩可进
一步划分为泥晶石灰岩、蠕虫石灰岩、鲡粒石灰岩、砂屑石灰岩、生屑石灰岩和泥质石灰岩等;白云岩可细
分为泥(粉)晶白云岩和颗粒白云岩.根据岩性、占生物化石、沉积构造等相标志分析，该剖面早、中三叠世
整体上依次经历了开阔陆棚、斜坡、开阔台地、局限台地、潮坪等沉积环境，台内局部发育浅滩.早三叠世大
冶期整体上为海退背景，属于开阔陆棚一斜坡沉积环境，嘉陵江期主要形成通个海进一海退旋回，属于开阔
台地一局限台地一潮坪沉积环境;中三叠世巴东期，主要以海陆交互沉积为主，整体上为局限台地沉积环境.
初步分析表明，研究区中、下三叠统具有良好的烃源岩条件和储集条件.

Abstract: The Xiakou section in Xingshan County of Hubci Province, with the well-developed Lower and Middle
Triassic,abundant in fossils and reliable sedimentary indicators with favorable exposure，is ideal for the study of ma-
rine strata in the Upper Yangtze area. According to the stratigraphic division and corrclation,the Lower Tmaswc was
divided into the Dayc and Jialingjiang Formations，and the MiddleTriassic comprised the Badong Formation, with a
thickness of 1217. 67 m. Limestones dominated the Lower and MiddleTriassic,followed by dolomite rocks,and a few
karst breccia and elastic rocks were developed in this area. Limestones could be further divided into micritic lime-
stones, vermicular limestones，gravelclast limestoncs，sandclast limcstones，bioclastic limestoncs and shaly lime-
stones,and dolomite rocks comprised of mierocrystalline-fine crystalline dolomite and particulate dolomite. Based on
the comprehensive analyses of lithology,palacontology and sedimentary structures，five types of sedimentary environ-
ment of the Early and Middle Triassic were generally developed in turn, such as open shelf facics, slope facics, open
platform facics,restricted platform facics and tidal flat facics,with shoal developed in the open platform.There was a
transgression event at Dayc Period of the Early Triassic with the sedimentary environment of open platform facics-
slope facics,however,the Jialingjiang Formation included four transgressive-regressive cycles with sedimentary envi-
ronments of open platform facics-restricted platform facics-tidal flat facics.The sedimentary environment of Badong
Period of the Middle Triassic was mainly domained by the restricted platform facics.The preliminary analysis shows
that the conditions of hydrocarbon source rocks and reservoir rocks of the Lower and Middle Triassic in the study ar-
ca are rather favorable

张震1.2**，鲍志东3，胡广成4. 湖北兴山峡口中下三叠统岩石学一沉积环境分析*[J]. 南京大学学报(自然科学版), 2013, 49(3): 343–355.

Zhang Zhen1.2，Bao Zhi Dong3，Hu Guang-Cheng4. Petrology and sedimentary environments of the Lower and Middle
Triassic of the Xiakou section in Xingshan County，Hubei Province
[J]. Journal of Nanjing University(Natural Sciences), 2013, 49(3): 343–355.

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