渤海海域石臼坨地區(qū)古近系沙河街組湖相生屑白云巖成因
發(fā)布時(shí)間：2019-02-15 17:47
【摘要】：渤海海域石臼坨地區(qū)石臼坨凸起東傾末端南北兩側(cè)的陡坡帶在古近系沙河街組發(fā)育多套生屑白云巖,其中南側(cè)生屑白云巖主要發(fā)育在沙河街組二段,北側(cè)生屑白云巖集中在沙河街組一段。為了明確該區(qū)生屑白云巖的成因,通過(guò)古生物、巖石薄片和地球化學(xué)等資料對(duì)該區(qū)生屑白云巖的巖石學(xué)、地球化學(xué)特征進(jìn)行較為系統(tǒng)的研究。按照巖石組分特征,研究區(qū)生屑白云巖可劃分為亮晶生屑白云巖和泥晶生屑白云巖2種類型。生屑的主要組分腹足類及介形類典型屬種分析顯示,南北兩側(cè)生屑白云巖均形成于淺水湖泊環(huán)境。地球化學(xué)Pr/Ph(姥鮫烷/植烷)參數(shù)反映,南側(cè)生屑白云巖形成于氧化環(huán)境,北側(cè)以還原性環(huán)境為主。碳氧同位素?cái)?shù)據(jù)反映南側(cè)生屑白云巖形成于低溫高鹽的封閉湖泊環(huán)境,以準(zhǔn)同生期的回流滲透成因?yàn)橹�。北�?cè)生屑白云巖的碳氧同位素相對(duì)分散,顯示為受不同流體介質(zhì)作用的結(jié)果,可以劃分出3種成因類型:準(zhǔn)同生期的回流滲透成因、埋藏期的鐵白云石化交代成因和晚期局部受熱液作用影響,因此,北側(cè)生屑白云巖是多期次多成因綜合作用的結(jié)果。該研究成果對(duì)開展這類中深層優(yōu)質(zhì)儲(chǔ)集層預(yù)測(cè)具有重要意義。
[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.
【作者單位】： 中海石油(中國(guó))有限公司天津分公司渤海石油研究院;
【基金】：國(guó)家科技重大專項(xiàng)(編號(hào):2016ZX05024-003)資助~~
【分類號(hào)】：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.
【作者單位】： 中海石油(中國(guó))有限公司天津分公司渤海石油研究院;
【基金】：國(guó)家科技重大專項(xiàng)(編號(hào):2016ZX05024-003)資助~~
【分類號(hào)】：P618.13
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1 A.C.瓦良卓夫;李春林;;論次生白云巖[J];地質(zhì)知識(shí);1956年10期
2 柴仁P，
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