渤海海域石臼坨地区古近系沙河街组湖相生屑白云岩成因
发布时间：2019-02-15 17:47
【摘要】：渤海海域石臼坨地区石臼坨凸起东倾末端南北两侧的陡坡带在古近系沙河街组发育多套生屑白云岩,其中南侧生屑白云岩主要发育在沙河街组二段,北侧生屑白云岩集中在沙河街组一段。为了明确该区生屑白云岩的成因,通过古生物、岩石薄片和地球化学等资料对该区生屑白云岩的岩石学、地球化学特征进行较为系统的研究。按照岩石组分特征,研究区生屑白云岩可划分为亮晶生屑白云岩和泥晶生屑白云岩2种类型。生屑的主要组分腹足类及介形类典型属种分析显示,南北两侧生屑白云岩均形成于浅水湖泊环境。地球化学Pr/Ph(姥鲛烷/植烷)参数反映,南侧生屑白云岩形成于氧化环境,北侧以还原性环境为主。碳氧同位素数据反映南侧生屑白云岩形成于低温高盐的封闭湖泊环境,以准同生期的回流渗透成因为主。北侧生屑白云岩的碳氧同位素相对分散,显示为受不同流体介质作用的结果,可以划分出3种成因类型:准同生期的回流渗透成因、埋藏期的铁白云石化交代成因和晚期局部受热液作用影响,因此,北侧生屑白云岩是多期次多成因综合作用的结果。该研究成果对开展这类中深层优质储集层预测具有重要意义。
[Abstract]:The steep slope zone at the north and south sides of the eastern tip of the Shiyutuo uplift in the Shijiutuo area, Bohai Sea, developed several sets of lithogenic dolomite in the Shahejie formation of the Paleogene, in which the southern side of the dolomite mainly developed in the second stage of the Shahejie formation. The dolomite in the north side is concentrated in the first section of Shahejie formation. In order to understand the genesis of the dolomite in this area, the petrology and geochemical characteristics of the dolomite are studied systematically through the data of paleontology, rock slice and geochemistry. According to the characteristics of rock composition, the dolomite in the study area can be divided into two types: bright crystalline dolomite and shaly clastic dolomite. The analysis of the main components of the bioclasts, gastropods and ostracods, shows that the dolomite on both sides of the north and south are formed in the shallow lake environment. The geochemical Pr/Ph parameters indicate that the dolomite is formed in the oxidation environment in the south and mainly in the reductive environment in the north. The carbon and oxygen isotopic data show that the dolomite formed in the low temperature and high salt closed lacustrine environment. The carbon and oxygen isotopes of the dolomite in the northern side are relatively dispersed, showing that they are affected by different fluid media, and can be divided into three genetic types: the origin of reflux infiltration in the quasi-syngenetic period, The metasomatic origin of iron dolomitization in the burial period and the late stage are affected by hydrothermal action. Therefore, the northern side of the dolomite is the result of multi-stage and multi-genetic comprehensive action. The research results are of great significance for the prediction of this kind of mid-deep high-quality reservoirs.
【作者单位】： 中海石油(中国)有限公司天津分公司渤海石油研究院;
【基金】：国家科技重大专项(编号:2016ZX05024-003)资助~~
【分类号】：P618.13
[Abstract]:The steep slope zone at the north and south sides of the eastern tip of the Shiyutuo uplift in the Shijiutuo area, Bohai Sea, developed several sets of lithogenic dolomite in the Shahejie formation of the Paleogene, in which the southern side of the dolomite mainly developed in the second stage of the Shahejie formation. The dolomite in the north side is concentrated in the first section of Shahejie formation. In order to understand the genesis of the dolomite in this area, the petrology and geochemical characteristics of the dolomite are studied systematically through the data of paleontology, rock slice and geochemistry. According to the characteristics of rock composition, the dolomite in the study area can be divided into two types: bright crystalline dolomite and shaly clastic dolomite. The analysis of the main components of the bioclasts, gastropods and ostracods, shows that the dolomite on both sides of the north and south are formed in the shallow lake environment. The geochemical Pr/Ph parameters indicate that the dolomite is formed in the oxidation environment in the south and mainly in the reductive environment in the north. The carbon and oxygen isotopic data show that the dolomite formed in the low temperature and high salt closed lacustrine environment. The carbon and oxygen isotopes of the dolomite in the northern side are relatively dispersed, showing that they are affected by different fluid media, and can be divided into three genetic types: the origin of reflux infiltration in the quasi-syngenetic period, The metasomatic origin of iron dolomitization in the burial period and the late stage are affected by hydrothermal action. Therefore, the northern side of the dolomite is the result of multi-stage and multi-genetic comprehensive action. The research results are of great significance for the prediction of this kind of mid-deep high-quality reservoirs.
【作者单位】： 中海石油(中国)有限公司天津分公司渤海石油研究院;
【基金】：国家科技重大专项(编号:2016ZX05024-003)资助~~
【分类号】：P618.13
【相似文献】
相关期刊论文 前10条
1 A.C.瓦良卓夫;李春林;;论次生白云岩[J];地质知识;1956年10期
2 柴仁P，
本文编号：2423578
本文链接：https://www.wllwen.com/kejilunwen/shiyounenyuanlunwen/2423578.html
