江陵凹陷新沟嘴组下段沉积环境与沉积特征
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摘要
为解决江陵凹陷新沟嘴组下段沉积时期古环境和沉积特征的问题,通过构造和沉积地貌恢复、岩心观察、元素和同位素测试等,定性或(半)定量重建了沉积环境,分析了该时期沉积特征。研究认为,新沟嘴组下段沉积时期具有广盆平缓古地貌特征,古水深相对较浅,古气候以干旱炎热为主,水体总体表现为封闭性,沉积环境纵向上自下而上呈现旋回性和周期性;在沉积环境控制下,江陵凹陷为远源浅水三角洲-湖相沉积体系,砂体类型多样,具"满凹含砂"的沉积特点。
In order to solve the problem of paleoenvironment and sedimentary characteristics during the sedimentary period of Lower Segment of Xingouzui Formation in Jiangling Depression,the sedimentary environment is qualitatively or semiquantitatively reconstructed and the sedimentary characteristics are analyzed by means of structural and sedimentary geomorphologic restoration,core observation as well as elementary and isotopic tests.The research suggests that during the sedimentary period of Lower Segment of Xingouzui Formation,where exists the characteristics of gentle paleogeomorphology with vast basins,the paleo-water depth is relatively shallow,the paleoclimate is dominated by drought and hot,the water body is totally enclosed,and the sedimentary environment is vertically cyclic and periodic from the bottom to top;under the control of above-mentioned sedimentary environment,the Jiangling Depression is a sedimentary system of distal shallow-water delta-lake facies with diverse types of sand bodies,it has the sedimentary characteristics of " depression wholly rich in sand".
In order to solve the problem of paleoenvironment and sedimentary characteristics during the sedimentary period of Lower Segment of Xingouzui Formation in Jiangling Depression,the sedimentary environment is qualitatively or semiquantitatively reconstructed and the sedimentary characteristics are analyzed by means of structural and sedimentary geomorphologic restoration,core observation as well as elementary and isotopic tests.The research suggests that during the sedimentary period of Lower Segment of Xingouzui Formation,where exists the characteristics of gentle paleogeomorphology with vast basins,the paleo-water depth is relatively shallow,the paleoclimate is dominated by drought and hot,the water body is totally enclosed,and the sedimentary environment is vertically cyclic and periodic from the bottom to top;under the control of above-mentioned sedimentary environment,the Jiangling Depression is a sedimentary system of distal shallow-water delta-lake facies with diverse types of sand bodies,it has the sedimentary characteristics of " depression wholly rich in sand".
引文
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[3]黄华,刘成林,张士万,等.深层富钾卤水的地球物理探测技术及应用——以江陵凹陷为例[J].矿产地质,2014,33(5):1101～1107.
[4]张永生,王国力,杨玉卿,等.江汉盆地潜江凹陷古近系盐湖沉积盐韵律及其古气候意义[J].古地理学报,2005,7(4):461～470.
[5]张永生,杨玉卿,漆志先,等.江汉盆地潜江凹陷古近系潜江组含盐岩系沉积特征与沉积环境[J].古地理学报,2005,5(1):29～35.
[6]王春连,刘成林,胡海兵,等.江汉盆地江陵凹陷南缘古新统沙市组四段含盐系沉积特征及其沉积环境意义[J].古地理学报,2012,14(2):165～175.
[7]沈均均,陈波,王春连,等.江陵凹陷古近系沙市组含膏盐岩系沉积特征研究[J].地球学报,2014,35(4):425～433.
[8]王春连,刘成林,徐海明,等.湖北江陵凹陷古新统沙市组四段硫酸盐硫同位素组成及其地质意义[J].吉林大学学报(地球科学版),2013,43(3):692～703.
[9]王春连,刘成林,徐海明,等.江陵凹陷古新世盐湖沉积碳酸盐碳氧同位素组成及其环境意义[J].地球学报,2013,34(5):567～576.
[10]沈立建,刘成林,徐海明,等.江陵凹陷古新统盐类矿物沉积特征及其成钾指示意义[J].矿床地质,2014,33(5):1020～1030.
[11]黄华,袁娟梅.江陵凹陷荆州背斜带形成演化及成藏特征[J].断块油气田,2013,20(3):301～304.
[12]洪汉烈.黏土矿物古气候意义研究的现状与展望[J].地质科技情报,2010,29(1):1～8.
[13]万锦峰,鲜本忠,佘源琦,等.基于伽马能谱测井信息的古水深恢复方法——以塔河油田4区巴楚组为例[J].石油天然气学报(江汉石油学院学报),2011,33(6):98～103.
[14]陈中红,查明,金强.自然伽玛及自然伽玛能谱测井在沉积盆地古环境反演中的应用[J].地球物理学报,2004,47(6):1145～1150.
[15]郑绵平,赵元艺,刘英俊.第四纪盐湖沉积与古气候[J].第四纪研究,1998,41(4):297～307.
[16]陈海霞.川西雅安地区白垩纪古环境古气候研究[D].成都:成都理工大学,2009.
[17] 李进龙,陈东进.古盐度定量研究方法综述[J].油气地质与采收率,2003,10(5):1～13.
[18] 游海涛,程日辉,刘昌岭.古盐度复原法综述[J].世界地质,2002,21(2):111～117.
[19]刘云生,罗劲,黄华,等.江汉盆地江陵凹陷南部斜坡带新沟嘴组下段滩坝成因及控制因素[J].中国石油勘探,2016,21(3):92～98.