川东南-黔北志留系石牛栏组沉积与层序地层

doi:10.11743/ogg20130411

摘要/Abstract

摘要： 基于地震、钻井及露头资料的综合分析,对川东南-黔北志留系石牛栏组及同期异相的小河坝组沉积与层序地层进行了研究。结果表明:①石牛栏组与下伏龙马溪组共同构成一个独立的三级层序,石牛栏组为高位体系域的一部分;②石牛栏组内部呈现为两个次一级的海平面升降旋回,可进一步划分为上、下两个四级层序;③台地边缘礁滩相在两个四级层序的高位体系域中均有一至两期小规模的发育,但在上部四级层序中最发育;④石牛栏组沉积期表现为台缘缓坡模式,因为台缘到斜坡没有明显坡折,加上陆源碎屑的影响,导致生物礁发育规模普遍很小,多呈点状或串珠状分布;⑤研究区内石牛栏组白云岩化作用总体上很弱,推测该时期海水盐度较低,主要由两个原因所致,一是来自南边黔中隆起及东边雪峰隆起的淡水河流注入导致研究区内海水盐度较低,二是台地边缘礁滩隆起幅度较低,无法形成相对局限的高盐度环境;⑥南川一带的小河坝组应当属于低河流能量、欠充沛物源且以悬浮搬运为主的低建设性浅水三角洲。

关键词: 沉积相, 层序地层, 石牛栏组, 小河坝组, 志留系, 黔中隆起, 雪峰隆起

Abstract: Based on the integrated analysis of seismic,drilling and outcrop data,this paper studied the deposition and sequence stratigraphy characteristics of Shiniulan & Xiaoheba formations in southeastern Sichuan-northern Guizhou pro-vinces.The following results were obtained.The Shiniulan Fm and its underlying Longmaxi Formation compose a separate third-order sequence,and the Shiniulan Formation is part of a high-stand system tract.There are two sub-eustatic sea le-vel cycles in the Shiniulan Formation,so this formation can be further divided into an upper and a lower fourth-order sequence.There are one to two development phases of platform margin reef & bank facies in the high-stand system tract of each fourth-order sequence,but the best platform reef & bank facies lies in the upper one.The bioherms developed during the deposition of the Shiniulan Formation are generally small and in scattered or beaded distribution due to the non-exis-tence of obvious slope break between platform margin and slope as well as the dilution of terrigenous inputs.In the study area,the dolomitization of the Shiniulan Fm is very weak as a whole.It is assumed that the salinity was low in this stage mainly due to factors.The first is the input of fresh water from the central Guizhou Uplift in the south and Xuefeng Uplift in the east.The second is the low amplitude of uplift of platform margin reef & bank.The sedimentary environment of the Xiaoheba Formation in Nanchuan area should be a shallow water constructive delta with low river energy,non-well deve-loped provenance and predominant suspension transport.

Key words: sedimentary facies, sequence stratigraphy, Shiniulan Formation, Xiaoheba Formation, Silurian, Central Guizhou Uplift, Xuefeng Uplift

中图分类号:

TE121.1

王正和,谭钦银,何利,等. 川东南-黔北志留系石牛栏组沉积与层序地层[J]. 石油与天然气地质, 2013, 34(4): 499-507. doi: 10.11743/ogg20130411 Wang Zhenghe,Tan Qinyin,He Li,et al. Deposition and sequence stratigraphy of the Silurian Shiniulan Formation in southeastern Sichuan-northern Guizhou province[J]. Oil & Gas Geology, 2013, 34(4): 499-507. doi: 10.11743/ogg20130411

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