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为了研究中国东北地区东部盆地群下白垩统烃源岩的特征与页岩气勘探潜力,对三江盆地、鸡西盆地、通化盆地、柳河盆地和红庙子盆地进行了野外样品采集、烃源岩地球化学与岩矿测试,同时统计了其他盆地烃源岩的地球化学参数。结果表明,东部盆地群下白垩统的烃源岩有机质丰度和类型主要受沉积相的控制,有机质成熟度受莫霍面埋深的影响。下白垩统沉积时研究区北部水体较浅,泥岩累积厚度大、粉砂质含量高,有机质丰度达到了差-中的标准,干酪根主要为Ⅱ2-Ⅲ型,目前处于成熟-高熟阶段。研究区南部水体相对较深,泥岩平均累计厚度为233~446 m,但泥岩质纯,有机质丰度较高,主要发育Ⅰ-Ⅱ2型干酪根,目前处于低熟-成熟阶段。东部盆地群下白垩统烃源岩脆性矿物含量较高,脆性较大,主要发育粘土矿物间孔缝、粒内孔和有机孔,具有微孔-中孔的孔喉结构,常规油气和页岩气勘探均具有良好的前景。
In order to study the characteristics of Lower Cretaceous source rocks and shale gas exploration potential in eastern basins in northeastern China, field samples were collected from Sanjiang, Jixi, Tonghua, Liuhe and Hongmiaozi basins, Chemistry and rock and mineral tests, and statistics of geochemical parameters of source rocks in other basins. The results show that the organic abundance and type of the Lower Cretaceous source rocks in the eastern basin are mainly controlled by sedimentary facies, and the maturity of organic matter is affected by the depth of Moho. Lower Cretaceous sediments in the northern part of the study area is shallow, thick mudstone thickness, high silt content, organic matter abundance reached the poor - in the standard kerogen is mainly Ⅱ 2 - Ⅲ type, is currently in the mature - high maturity stage . The water body in the southern part of the study area is relatively deep. The average accumulated thickness of mudstone is 233 ~ 446 m. However, pure mudstone and high abundance of organic matter mainly develop Type I-II2 kerogen, which is currently in the low-ripening stage. Lower Cretaceous source rocks of the eastern basin group are characterized by high brittle mineral content and large brittleness, mainly including intergranular cracks, intragranular pores and organic pores in clay minerals, pore-throat structures with micropore-mesopores, conventional hydrocarbons and shale Gas exploration has a good prospect.