自然伽马能谱测井在阜新盆地沙海组下段油层的应用——以辽阜地2井为例

APPLICATION OF NATURAL GAMMA-RAY SPECTROMETRY LOGGING IN THE LOWER SHAHAI FORMATION IN FUXIN BASIN:A Case Study of LFD-2 Well

阜新盆地油气调查与勘探历史悠久,油气发现虽多,有的井甚至初期获得了少量产能,但却无一持续稳产. 2017年,辽阜地2井在阜新盆地沙海组下段获得了高产工业油流,日产15.3 m3,实现了油气调查勘探的重大突破.为了深入研究阜新盆地沙海组下段的地层特性,运用自然伽马能谱测井资料,对辽阜地2井沙海组下段的泥质含量、黏土矿物类型以及沉积环境等进行分析,明确了沙海组下段的泥质含量及其变化情况,查明沙海组下段形成于氧化与弱还原交互的沉积环境,水动力条件弱(以低能为主).本研究为进一步认识沙海组下段储层特征提供了依据,有助于阜新盆地后续的油气勘探及理论研究.

The oil-gas survey and exploration in Fuxin Basin has a long history.Despite quite a few oil-gas discoveries and even low production obtained from some wells in the beginning,none of them have sustainable and stable production.In 2017,high-yield industrial oil flow was obtained from LFD-2 well in the Lower Shahai Formation of Fuxin Basin,with a daily production of 15.3 m3,achieving a major breakthrough in oil-gas survey and exploration.To further study the stratigraphic characteristics of Lower Shahai Formation in Fuxin Basin,the natural gamma-ray spectrometry logging data are used to analyze the shale content,clay mineral type and sedimentary environment of Lower Shahai Formation in LFD-2 well,which ascertains the shale content and its variation.It is concluded that the Lower Shahai Formation was formed in a sedimentary environment of interactions between oxidation and weak reduction,with weak hydrodynamic conditions(mainly low energy).The study provides a basis for further understanding of the reservoir characteristics of Lower Shahai Formation and contributes to the following oil-gas exploration and theoretical research in Fuxin Basin.