Research On Hydrocarbon Accumulation For Cretaceous In Ninth District Of Tahe Oil Field

The north of Tahe oil field is highly explorated in this area. Trias is the principal producing formation in Tahe Oil Field which has a high degree of exploration and research. We have made a lot of study on top, middle and bottom oil group in Trias acquiring a high productivity. There's little latent capacity in remained traps. The exploration aimed at clastic reservoir is just at the beginning. Although only a few traps has been fixed, it has a huge reservoir thickness and a beneficial configuration between reservoir and cap formation showing a favorable exploration potential.According to the recent well testing report, the clastic reservoir in the east of Tahe Oil Field shows a prospecting evidence of oil and gas.This paper investigates the Cretaceous system in Ninth District of Tahe Oil Field, using theories as sedimentology, petroleum geology, et al. Based on abundant outcrop sections, well drilling and the manifold testing sample of drill core, analyzes the distribution of oil and water. We knew that on the longitudinal Cretaceous system oil mainly distributes in Shushanhe formation. It is the main water reservoir layer development in Cretaceous system. The sand body in Yageliemu formation,baxigai formation and Bashijiqike formation are high water cut aqueous layer, oiliness is bad. On the crosswise oil mainly distributes in take the T903 well as the central sub-area, Moreover sees nearby the other sub-area individual well has the small scope oil accumulation.In-depth study of the forming conditions in the Ninth District of Tahe Oil Field secondary hydrocarbon reservoir, controlling factors of hydrocarbon accumulation, the main period of hydrocarbon accumulation, summarized the law of hydrocarbon accumulation. Controlling factors of oil and gas enrichment, the first, framework of areal structure controls oil and gas migration, the second, reservoir rock and Combination of reservoir and cap rock control of oil and gas enrichment, the third, fracture control of oil and gas accumulation; integrated oil and gas rich reservoir of law are"Fracture Control Of Oil""Power Drive Oil"and"Typhonic Rock And Shallow Burial". Accumulation of various elements in the configuration of space and time relations, Cretaceous hydrocarbon reservoir is formed in Indo-Chinese epoch and Yanshan epoch, it is shaped in Himalayan epoch, based on this and has established the pattern.In the consolidated sedimentary facies distribution, seismic processing results, well logging interpretation, reservoir forming conditions, and gas accumulation on the basis of the understanding, prediction and delineation of the favorable oil and gas rich block. One of the delineated based is far away from the source, sediment sorting, roundness better, highly porous sedarenite; the second is the depositional trap and defomational trap near discordogenic fault that fracture to the Ordovician.