干旱区生态环境知识资源中心(Arid): 川西地区中三叠统雷口坡组四段上亚段沉积特征

Arid

	川西地区中三叠统雷口坡组四段上亚段沉积特征
其他题名	Sedimentary characteristics of the upper part of the fourth member of Leikoupo Formation of Middle Triassic in western Sichuan Basin
	宋晓波; 隆轲; 王琼仙; 廖荣峰; 陈颖; 许国明; 苏成鹏
来源期刊	石油实验地质
ISSN	1001-6112
出版年	2021
卷号	43 期号:6 页码:976-985
中文摘要	利用野外露头、钻井岩心、测井、岩石薄片以及碳氧同位素等资料,对川西地区中三叠统雷口坡组四段上亚段沉积特征与沉积模式进行系统分析,明确储层发育有利沉积相带。川西地区中三叠统雷口坡组四段上亚段沉积时期主要为局限-蒸发台地潮坪沉积环境,发育膏云坪、(藻)云坪、(藻)云灰坪、(藻)灰云坪、(藻)砂屑滩、(藻)灰坪、砂屑滩等沉积微相。通过沉积模式的建立,认为川西地区雷四段上亚段沉积时受滩/岛的阻隔及干旱气候条件等因素影响,海水补给受限,在强蒸发作用下海水逐渐咸化,形成高盐度的沉积环境,有利于大规模白云岩化;川西地区地势平坦、水体浅、能量低,多期频繁的暴露引起了大气水淋滤溶蚀作用;藻类广泛发育,藻类活动所形成的碳酸盐岩类型多样,主要有藻叠层白云岩、藻凝块白云岩、藻纹层白云岩和藻砂屑白云岩等。综合分析认为,川西大部分地区在该时期为潮间带(藻)云坪微相沉积,有利于准同生期暴露并接受大气水淋滤溶蚀,是孔隙型储层发育的有利区带。
英文摘要	Based on the data of outcrop,drilling core,logging,rock thin section and carbon and oxygen isotope test,this paper carried out systematic analysis for characteristics and model of sedimentary of the upper part of the fourth member of Leikoupo Formation in western Sichuan Basin,favorable sedimentary facies for the development of reservoir were proposed.Results showed that in the sedimentary period of the upper part of the fourth member of the Middle Triassic Leikoupo Formation,the western Sichuan Basin was in the sedimentary environment of tidal flat within restricted and evaporative platform.The sedimentary microfacies were gypseous-dolomite flat,(algae)-dolomite flat,(algae)-dolomite-lime flat,(algae)-lime-dolomite flat,(algae)intraclast beach,(algae)-lime flat,intraclast beach etc.According to the establishment of the sedimentary model,due to the barrier of beach/island and the influence of arid climate conditions,the seawater supply was limited during the deposition of the upper submember of the fourth member of Leikoupo Formation in the western Sichuan Basin,which formed a high salinity sedimentary environment by strong evaporation and was good for large-scale dolomization.Flat terrain,shallow water,low energy,and the frequent exposure of multiple periods caused atmospheric water leaching and dissolution in the western Sichuan region.Algae were widely developed,which formed diverse carbonatite by algal activities,including algal stromatolite dolomite,algal clot dolomite,algal lamina dolomite and algal arene dolomite.By comprehensive analysis,for most part of the western Sichuan Basin,it was in the intertidal zone (algae)-dolomite flat sedimentary area,which was favorable for the penecontemporaneous exposure to atmospheric water leaching and dissolution,and was a favorable developing zone for porous-type reservoir.
中文关键词	潮坪亚相 ; 沉积特征 ; 雷四段上亚段 ; 三叠系 ; 川西地区
英文关键词	tidal flat subfacies sedimentary characteristics the upper part of the fourth member of Leikoupo Formation Triassic western Sichuan Basin
类型	Article
语种	中文
收录类别	CSCD
WOS类目	Energy & Fuels
CSCD记录号	CSCD:7104292
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/377890
作者单位	宋晓波, 中国石化西南油气分公司勘探开发研究院, 成都, 四川 610041, 中国.; 隆轲, 中国石化西南油气分公司勘探开发研究院, 成都, 四川 610041, 中国.; 王琼仙, 中国石化西南油气分公司勘探开发研究院, 成都, 四川 610041, 中国.; 廖荣峰, 中国石化西南油气分公司勘探开发研究院, 成都, 四川 610041, 中国.; 陈颖, 中国石化西南油气分公司勘探开发研究院, 成都, 四川 610041, 中国.; 许国明, 中国石化西南油气分公司勘探开发研究院, 成都, 四川 610041, 中国.; 苏成鹏, 中国石化西南油气分公司勘探开发研究院, 成都, 四川 610041, 中国.
推荐引用方式 GB/T 7714	宋晓波,隆轲,王琼仙,等. 川西地区中三叠统雷口坡组四段上亚段沉积特征[J],2021,43(6):976-985.
APA	宋晓波.,隆轲.,王琼仙.,廖荣峰.,陈颖.,...&苏成鹏.(2021).川西地区中三叠统雷口坡组四段上亚段沉积特征.石油实验地质,43(6),976-985.
MLA	宋晓波,et al."川西地区中三叠统雷口坡组四段上亚段沉积特征".石油实验地质 43.6(2021):976-985.