The Influence Of Reservoir Architecture Model In Hudson Donghe Sandstone Reservoir To The Remaining Oil Distribution Patterns

The Hudson oil field, a typical concave-in-apophsis and in excellentaccumulation conditions, is located on the Hudson structure belt of Manjiaer concavein the Tarim Basin. Hudson structure belt is a low-amplitude anticline structure beltwhich grew on the extending southward nose-like uplift of Lun low bulge in Tabeiuplift.East River sandstone is divided into the upper and lower two parasequences. Thelower parasequence is on ultra-deposition in sea-level rising period, and the upperparasequence is into the product deposition to the sea in sea-level falling or regressingperiod. Ease River sandstone is wave-dominated sandy shore deposition with nobarrier. It is divided into four subfacies, and from the shore to the sea followed thecoast dune subfacies, backshore subfacies, foreshore subfacies and shorefacesubfacies. Reservois properties is of medium porosity and medium to highpermeability. The fluid properties is single, mainly in normal to slightly heavier blackoil. Hudson oil field has undergone more than one adjustment period since investingin development in1999, and now its recovery level is20.17%and its integrated watercut is49.83%. The reservoir has characteristics of tilted oil-water interface andwedge-shaped reservoir. After a longer period of high-speed development, thedistribution of remaining oil is very complex, and it is difficult to know how oil andwater flow. There is a rather vague understanding of reservoir architecture modelaffecting on the distribution of remaining oil. What’s more, the main direction andlevel of stable production adjustment is not yet clear.From the actual situation of reservoir, referring to previous geological knowledge,we identified four basic reservoir architecture style, including reservoir architecture ofparallel interlayers, reservoir architecture of diagonally intersecting interlayers,reservoir architecture of slot-shaped interlayers and complex reservoirarchitecture.Then, we identified mainly calcareous interlayers, followed by denselaminated and politic interlayers in the East River sandstone.The properties standards to identify interlayers is porosity of less than8%and permeability of less than5×10^-3μｍ².Using geostatistics and PETREL modeling software, we build3D visualizationof the reservoir level model, structural model, architecture model and reservoirparameter model of typical well area, which quantitatively characterize thedistribution characteristics of the underground reservoir. We choose ECLIPSE2006black oil simulator to simulate the geological model. The result of history matching isthat interlayers development and distribution is the main factors that inhibit thereservoir bottom water coning. Wide or narrow cones of water formed when the waterunder the production well breakthrough the blocking off of interlayers and invertedcone-shaped distribution of remaining oil formed in the interwell. Water cut ofproduction well has a direct relationship with the development, distribution andfrequency of lower interlayers. These also makes the water coning under theproduction well and inverted cone-shaped distribution of remaining oil in the interwellshowing some irregular.On the basis of the reservoir architecture study and dynamic data analysis, we studynumerical reservoir simulation of practical geological model and conceptual model intypical well area and build remaining oil distribution pattern model controlled by fourdifferent architeture style. At the same time, we carry out the sensitivity analysis ofreservoir architecture in the development by natural energy and artificial recharge, andthe influence law of sensitivity factors of different architecture model to productionand distribution of remaining oil. Then, compared to the actual situation of the typicalwell area, the corresponding development adjustment proposal is recommended.