Sedimentary Facies And The Influence To The Reservoir In Triassic And Jurassic System In Yangduxi And The Vicinage In Eastern Sichuan

Under the guidance of related theories and research result at home or abroad, such as sedimentology, stratigraphy, paleontology, reservoir geology and diagenesis...etc. , with the open country profile and drill or well logging data as research object, adopt the traditional open country, indoor test the research that means combine together with modern method, make use of the seism and the well logging data processing results, and combine the areal geology data and the research result of the past, after studied the rock, sedimentary facies(sedimentary environment) and the influence to reservoir of Triassic System and Jurassic System in Yangduxi Fabric and the vicinage, the conclusion is as follows: 1. Each formation inside the area has the more obvious difference in the rock etc., tracking and stratigraphic correlation can be done between each well. 2. Triassic System and Jurassic System mainly has the carbonate rock, the cream salt rock and clastic rock three major type inside the area, clips to imply a little amount coal seam, the volcanic rock is very few, among them, crystalline dolomite and siltstone or packsand is main reservoir rock, mainly distributing in the second and The fourth Jialingjiang Formation, Shaximiao Formation, Lianggaoshan Formation, the reservoir type are lords for the fracture - pore type and the pore types respectively. 3. For the formation inside research area, sedimentary facies can divide to carbonate platform, basin, onshore plain, lacustrine delta and lake five facieses, and some subfacies or microfacies also; among them , platform margin subfacies, min bank inside platform, the dolomite-plateaux microfacies within evaporate platform subfacies, shallow and shore subfacies in lake facies, deltaic front subfacies and river channel subfacies of the onshore plain facies are advantageous to the reservoir formation, the concentration distributes to medium and top part in the third Feixianguan Formation, some parts of the second and forth Jialingjiang Formationd and some parts of Xujiahe, Lianggaoshan, Shaximiao Formation. 4.The reservoir inside the area research Formation is controlled by sedimentation, still under the influence of the diagenesis in addition, such as press and solid pressolution, cementation, dolomitizationand dissolutions, front both belong to the destructiveness constructive diagenesis, empress both belong to the constructive diagenesis. 5. The reservoir can be divided into crystalline dolomite reservon\ the grainstone reservoir and sandstone reservoir three major types basis on rock; crystalline dolomite reservoir often can be found in the second Jialingjiang Formation, mainly be constitute by the crystalline dolomite; grainstone reservoir can be found in the third Feixianguan Formation more familiar, mainly be constitute by the oolite limestone; sandstone reservoir is familiar in Lianggaoshan formation and Shaximiao formations, the rock mainly be constitute by medium - tiny particle quartzose sandstone and arkose, the lithic sandstone is less. 6. In the Lengthways, there are several reservoirs in Yangduxi and theVicinage in Eastern Sichuan. Among them, the second Jialingjiang formation in the Triassic System is the best the beneficial reservoir, the next is Shaximiao formation, Lianggaoshan formation and Xujiahe formation. Reservoir does not really develop in other formation. From horizontal, the second Jialingjiang formation have certain continuity and distribute the scope wide, is an initial exploration target in area; sandstone in Shaximiao and Lianggaoshan formation are beneficial exploration target in the shallow inside the area by the reason of the wide and thick sandstone formation; thick sand body in the Xujiahe formation is a better reservoir in wide area, can be look at the alive exploration target in the area.