The Es₄ Sequence Stratigraphy And Sedimentary Facies Researching In Niuxintuo Area Of Liaohe Fault Depression

This project summarized the hydrocarbon distribution rule and the control factors of hydrocarbon reservoir forming in the Niuxintuo Area through the sequence stratigraphy and sedimentary study, and achieved the following results :1.By the character of the sediment evolvement and the seismic in the Niuxintuo Area Es4 bed identify four third-order sequences boundary and the Es4 bed is divided into three third-order sequences sequence stratigraphic framework was established.2.There formed the extensional fault in NE in Niuxintuo area,the Taian fault Songjia fault and Niuxintuo fault control the sedimentary and the tectonic evolution,control the distribution vary of center uplifting and the faults zone features, contol the types and the distribution of traps. Since the late Paleogene the main fault of Niuxintuo area have strike-slip movement and inversion,Songjia fault have entirely inversion and became reverse fault.The characteristic of the Niuxintuo fault due to it’s strike.3.Analysis the sedimentary facies distribution and reservoir heterogeneity in the sequence stratigraphic framework,figure that the intensive activity period is the sandbody development period.The Central Rise is the main sediment origin and the West Rise is the sub sediment origin. Figure that the west slope region is in favor of forming the structural lithologic reservoirs, near the east faults are the fault block reservoirs. The change rate of the inhomogeneity parameter in the Sag center is large so that there are more subtle reservoirs.4.Different tectonic stress fieldt and tectonic mechanics control the sag and tectonic framework and the filling sequences, thus they contoled the hydrocarbon’s distribution and evolution,and control the characteristics of the reservoirs and caprocks and the types of the traps, then effect the hydrocarbon enrichment. The study results indicated that hydrocarbon accumulation models in Niuxintuo area include the distribution of effective source rocks and faults hydrocarbon accumulation models.