CAJ | 학술논문

黑龙江东部盆地群是我国东部重要的中生代陆相含油气区,属东北含油气亚区的一部分.早白垩世以陆相湖泊沉积为主,但有多次规模不等的海侵事件发生,本次研究进一步对鸡西盆地鸡 D7井下白垩统城子河组和穆棱组砂岩的结构构造、矿物排列、碎屑岩组分、胶结物、综合结构系数、重矿物等特征进行了综合分析研究:在早白垩世地层发现了具典型滨海潮下带特征的双粘土层构造;该层位砂岩多为少石英或者石英含量在25%左右的长石岩屑砂岩和岩屑长石砂岩;胶结物以碳酸盐为主;受海侵作用影响,城子河组砂岩综合结构系数平均值为20.16,穆棱组平均值为46.65,表明穆棱期比城子河期受海侵影响更为明显;并且在砂岩中发现重矿物20余种,呈条带状富集,尤其是特征矿物海绿石、自生独居石、莓状黄铁矿及自然金等具明显海侵相特征.本次研究为黑龙江东部盆地群海侵的存在提供了一系列沉积学证据.
흑룡강동부분지군시아국동부중요적중생대륙상함유기구,속동북함유기아구적일부분.조백성세이륙상호박침적위주,단유다차규모불등적해침사건발생,본차연구진일보대계서분지계 D7정하백성통성자하조화목릉조사암적결구구조、광물배렬、쇄설암조분、효결물、종합결구계수、중광물등특정진행료종합분석연구:재조백성세지층발현료구전형빈해조하대특정적쌍점토층구조;해층위사암다위소석영혹자석영함량재25%좌우적장석암설사암화암설장석사암;효결물이탄산염위주;수해침작용영향,성자하조사암종합결구계수평균치위20.16,목릉조평균치위46.65,표명목릉기비성자하기수해침영향경위명현;병차재사암중발현중광물20여충,정조대상부집,우기시특정광물해록석、자생독거석、매상황철광급자연금등구명현해침상특정.본차연구위흑룡강동부분지군해침적존재제공료일계렬침적학증거.
The Cretaceous basins in east Heilongjiang Province constitute a very important oil-producing region. In Early Cretaceous, lacustrine facies was the dominant facies, while different scales of transgression occurred at the same time. According to further study and comprehensive analysis of texture, structure, clastic constituents, comprehensive textual coefficient, cement and mineral arrangement of the Cretaceous sandstones, the double layers were found in Early Cretaceous strata, which constituted the typical structure in the subtidal zone. The main types of Cretaceous sandstones are debris-feldspar sandstones and feldspar-debris sandstones (quartz content ca. 25%), whereas cements are carbonate. Influenced by the transgression, the average value of comprehensive textual coefficient was 20.16 in Chengzihe period and 46.65 in Muling period, indicating that transgression influence was more obvious in Muling period. Moreover, more than 20 kinds of heavy minerals were found in Cretaceous sandstones, assuming banded enrichment. The characteristic minerals such as glauconite, authigenic monazite, framboid pyrite and native gold all show transgression characteristics. All of these characteristics provide abundant evidence for the transgression in the Cretaceous basins of east Heilongjiang Province.