准东区块博格达山前带推覆体地层及含油性认识

Nappe stratum and oiliness of Bogda mountain front in Zhundong block.

准东区块博格达山前带位于准噶尔盆地东南部,该区块勘探程度低,相对于准东区块北部地区,博格达山前带推覆体地层内部认识少。在逆掩构造运动背景下,推覆体地层形成了特殊的地层沉积特征及含油性。通过准东区块已钻取的Q 1井、M 2井等5口井资料,从岩电、镜下薄片及古生物等方面进行分析,认为准东区块博格达山前带推覆体地层内部具反旋回沉积特征、沉积具不均质性、为具有碎屑岩和火成岩的双重特征以及多样性的储集空间,运用岩石热解气相色谱及荧光显微薄片等技术手段判断其含油性具中质油特征。

Bogda mountain front of Zhundong block is located in the southeast of Junggar Basin,the exploration degree of this block is low. Compared with the northern part of Zhundong block,there is little understanding of the inner stratum of nappe in Bogda mountain front. Under the background of overthrust structure movement,the strata of the nappe formed special stratigraphic sedimentary characteristics and oiliness. Based on the data of 5 drilled wells,such as wells Q1 and M2 in Zhundong block,from the aspects of rock electrical properties,microscopic thin section and palaeontology,it is recognized that the inner stratum of the nappe in Bogda mountain front,Zhundong block has the features of anticycle sedimentation,the heterogeneity of sedimentation,dual nature of clastic rocks and igneous rocks,and the diversity of the reservoir space. The oiliness characteristics of medium oil were judged by means of thermal evaporated hydrocarbon chromatograph of rock and fluorescence micro-section.