Using the data of homogenization temperatures of fluid inclusions,burial and thermal history, evolution of palaeostructure,hydrocarbon accumulation period of the Fuyu oil layer in the southern Fuxin Uplift, Songliao Basin,is defined in the end of Nenjiang Formation and the end of Mingshui Formation. On periods of hydrocarbon formation reservoirs,vertical hydrocarbonreversed migrationis the major hydrocarbon migration way within oil source. The overpressure of K1qn1 mudstone is motivating force of oil migration downward. The source faults are mainly migration pathway of oil migration downward. Hydrocarbon migrationis the major hydrocarbon migration way in the outer margin and outside of oil source. First,volumes of oil resulting from inner oil source migrated vertically to reservoirs of inner oil source. Then them migrated long-distance laterally to effective traps in the outer margin and outside of oil source through advantage hydrocarbon migration way. On this basis,a model for hydrocarbon accumulations is presented,and it includes following directly drained and reversed migration with lateral migration at a short distance,fault screened trap in the slope,multiple hydrocarbon accumulation and lateral migration at a long distance. It provides an important basis for supporting the new oil rich region of the Fuyu oil layer in the southern Fuxin Uplift,Songliao Basin.
Using high-resolution sequence stratigraphy theory, We analyzed 22 drill cores and 4256 well log data, in order to characterized the sedimentary squence and base-level cycls in the Putaohua reservoir of the Sanzhao Sag. The Putaohua reservoir includes two medium-term base-level cycle, four short-term base-level cycles, and eight super-short-term base-level cycles. Thus a high-resolution sequence stratigraphic framework has been established. The Putaohua reservoir is controlled by syn-depositional uplifting which resulted in the southward thinning of the super-short-term base-level cycles. From the northwest to the south in the Sanzhao Sag, the upper sandstone body in the Putaohua Reservoir offlaps northward and is gradually replaced by muastone in the southern part of the Sag the Lower sandstone body of the Putaohua reservoir onflaps southward and is gradually replaced by mudstone in the southern part of the Sag.
Yishu basin is one of a great group of Mesozoic-Tertiary fault basins in Northeast China. It is a narrow-long oil-producing basin with a 7:1 ratio of length to width. The basin is filled by 2-6 km of Eocene to Miocene and is confined by two parallel normal faults. Its geometry and unsymmetry determine the spatial distribution and evolution of organic facies. Eocene dark mudstone of deep lake is the source rock, and interfan or filled lake swamps facies contain coal. Because of development of short transversal alluvial series and plentiful terrestrial matter, frequent gravity current disturbs the stagnant reducing environment and deteriorates organic matter. As a result, humic matter is dominant in source rock with TOC 0.7-1.3%, H/C ratio 0.6-1.1, IH less than 120 mg/g{sub TOC}, and high Pr/Ph, {delta}{sup 13}C {minus}25.40% (PDB). Products of kerogen pyrolysis have rich aromatics. This basin produces light oil with API 40-60{degree} and heavy gas with 20-40% of C{sub 2}-C{sub 5}. Important implications for further exploration are evident. Though this group of lacustrine fault basins is located within the same climatic plant zone, only those having enough subsidence rates with buried depth greater than 3 km tend to be oil-generating basins, of which themore » narrow-long one is inclined to produce light oil and condensate.« less
In complex sandstone reservoir with medium-low porosity and low salinity of formation water and fast changes of rock structure,the oil-bearing property evaluation accuracy is always the difficult problem in logging interpretation in Erlian area.Based on the theory of dielectric log interpretation,this paper introduces the application effects of dielectric log in identifying oil and water beds,and sets up the logging interpretation norms of dielectric log,and provides an effective way to evaluate the oil-bearing property in complex sandstone reservoir.47 MHz dielectric log displays the residual oil and gas in the transition zone.Quantity of the residual oil has a relation with the formation porosity,pressure,drilling fluid pressure and the like.When porosity is the same,the dielectric log is better in medium-low permeability reservoir than in high permeability reservoir.In practical log operations,we must build log interpretation criteria for different zones and different layers respectively.Field log data show the measuring precision of 47 MHz dielectric log is higher when formation resistivity is over(5 Ω·m) and mud resistivity over 1 Ω·m.
On the basis of core observation,grain analysis and thin section studies,the lacustrine storm deposits in Qingshankou Formation in southern Songliao Basin are studied.The main types of storm deposits characteristics are identified,including hummocky cross-stratification,surface of scour,gutter cast,truncated structure,water-escape structure,bioturbation etc.Grain analysis indicates that saltation population is central yet suspension population is minor in storm deposits.Similar Bouma sequence is abstracted from the storm deposits of Qingshankou Formation.There are two provenances for storm deposits in this area,in which one comes from(fan) delta,and the other comes from beach and bar of shallow lake.Based on sedimentary features and transported instance,storm deposits are divided into autochthonous tempestites and allochthonous tempestites.
Determination of gas well rational productivity is one of the most important foundations of gas reservoir economic development decision among the development project planning. The research area is mainly in Zizhou gas field Y30 borefild,The research content according to AOF Gas or physical property will be divided into three categories,According to different well types corresponding to the given r advisable output. several research methods, such as absolute open-flow capacity, index curve of gas production , drop in pressure of well head and numerical simulation, were applied to optimize and determine the rational productivity of gas well.according to the several methods of comprehensive analysis ,that the reasonable production on gas well production with the more significance.
Based on 22 well cores,4000 logging data and initial potential data,sedimentary characteristics and mode of shallow lacustrine fluvial-dominated delta of Putaohua reservoirs in Sanzhao sag,Songliao basin were analyzed. It is realized that submerged distributary channel sandbodies as sand body framework of this delta system is abundant,closely and narrow. It is continual than original understanding and it extends to the far underwater,until disappearing into thin sheet sands. Debouch bar sands is not well preserved and is fluvial-dominated. Based on understanding of sedimentary background and sedimentary characteristics and sedimentary facies types of Putaohua reservoirs in Sanzhao sag,sedimentary mode of shallow lacustrine fluvial-dominated delta is established,and sedimentary mode of six subfacies is further divided. Shallow lacustrine fluvial-dominated delta outer front is mode of tide-dominated sheet sand; Transition region of inner front and outer front is mode of fluvial-dominated sheet sand; Inner front is mode of fluvial-dominated debouch bar and mode of fluvial-dominated banding; Transition region of front distributary plain is mode of inshore;Delta distributary plain subfacies is mode of fluvial-dominated banding.It provides the solid geological basis for the establishment of spatial distribution pattern of reservoir,identify the causes of mainly monosandbody and further tapping the potential of oil field.
Taking Fuyu oil layer in the southern Fuxin Uplift of Songliao Basin as an example,through study on types and distribution characteristics of found reservoirs,this article discussed hydrocarbon accumulation characteristics and its main controlling factors in lithologic reservoirs area outside oil source area.The results show that reservoirs types of Fuyu oil layer are mainly local structure—lithologic reservoirs in the southern Fuxin Uplift.Characteristics of hydrocarbon accumulation is tertiary structure controlling direction,single trap controlling hydrocarbon accumulation,local structure controlling boundary and monosandbody controlling layer.General direction of hydrocarbon migration is controlled by tertiary structure,and hydrocarbon accumulation is controlled by single trap.Planar distribution boundary of hydrocarbon is controlled by boundary of local structure and monosandbody in single trap,and vertical distribution layer of oil/water is controlled by vertical development characteristics of monosandbody.Local structure,single distributary channel sandbody and their array mode is main controlling factors on complicated distribution of oil/water.It is supported an important realistic significance to complicated exploration and development of lithologic reservoirs.
During its interaction with local climate, flow, shallow soil and other elements, vegetation appears to be of certain hydro-mechanical and ecological effects on erosion control. Vegetative slope protection has many advantages compare with traditional protection measures for its special effect cause. As long as we follow scientific design principle and choose sound method, during the forming of ecological slope protection system and developing with surrounding ecological system, streambank is protected.
According to the technological characteristics of crude oil dewatering process and the requirement of control system, a dynamic mathematical model of crude oil dewatering process is established. By studying the relation among the system variables and the disturbance response of output, corresponding relation between input and output was changed during the control system design. Practical application of the control system in joint station of Daqing oil field shows that the controllability and the stability were greatly improved. It is useful to improve the control scheme of oil\|water separation.
