The Research On Hydrocarbon Enrichment Regularity Of Chang8Reservoir In The Jingbian Western Region

This paper investigates the Chang8group in Triassic Yanchang Formation of theJingbian western region, Ordos basin. In the learning of sedimentary cycle, the bed of ChangSis subdivided into ChangSi and ChangSi in ascending order, according to the obviouscharacteristic of log and that one’s property of rock (the marker bed of KO、Kl). Reveal oil andgas enrichment regularity of the changS from the sedimentary facies and sand bodydistribution, reservoir conditions, the classification and comprehensive evaluation of reservoir,reservoir distribution characteristics and so on.Through the core and logging facies analysis, it is considered that the subfacies of Chang8oil bearing Formation were mostly consists of Meandering river delta front. Inlegraled avariety of testing methods, research suggests the rock type is mainly feldspar sandstone andlithic feldspar sandstone. Main diagenesis includes compaction, cementalion and dissolution.Original hole in the study area is mainly residual original intei^ranular pore and dissolulionpore, tiny cracks is relatively little. In addition, combined with data of Yanchang formationreservoir pore structure that the area is mainly ifne holes micro-ifne throat. On the basis ofcore analysis data, adopting the method of multi-parameter comprehensive analysis evaluateChangS reservoir. Finally divided into: good (I), medium (II), bad (III), density (IV) fourtypes of the reservoir.Chang8reservoir in the Jingbian western region is lithological reservoir, Goodhydrocarbon source rock is ihc base of Oil and gas enrichment, compositing Sand thick figureand oil thick figure, it is considered that Oil and gas enrichment is mainly controlled bysedimentary microfacies and sand body development degree. Drawing chang7-chang9reservoir and combination pattern, il is considered that the configuration relationship ofhydrocarbon generation and reservoir are mainlyUnder the guidance of ihc law. for the speciifc geological conditionsof the study area, favorable areas of Chang8oil bearing Formation arc predicted with oiltesting data. IT class is2，Illclass is7，A total of nine.