The reservoirs are tight sand, with an average porosity of 4. 74% and permeability of 0. 417×10-3 μm2. Delta front underwater distributary channel and mouth bar are the favorable reservoir micro-facies.
on delta plain, the acceptable space-sedimentary supply ratio (A/S) was the key factor of controlling the superposition and migration of distributary channel sand bodies;
In addition, the microfacies of sediments would also control the reservoir quality. The glutenites deposited in subaqueous distributary channels in front of the fan delta have the best reservoir quality with an average porosity and permeability of 20.5% and 350×10 -3 μm 2,respectively.
In the period of Yan 9 deposition, the sedimentary environment was delta-lacustrine, the subfacies were mostly delta plain and delta front, and the microfacies were distributary channels, inter-channel depressions, underwater channels and inter-channel bays.
Delta front subfacies include 6 kinds of microfacies: underwater distributary channel, natural levee, crevasse spray, bay mud between distributary channels, mouth bar and frontal thin sand layer.
Distributaries channel sand bodies in Yanchang 2 group were developed widely for oil and gas accumulation. The main type of pores is primary pore. The porosity and permeability of reservoir is about 15% and 10×10 -3 μm 2 around which belongs to low porosity and permeability reservoir.
Material source are mainly from southern and northeast of the working area. Sand types are mainly of delta front subwater distributaries channel sand body, river mouth bar and sheet sand body with large degree of planar variation.
(2) There are 7 micro sedimentary facieses including under water distributaries channel, rnouth bar, sand sheet, channel flank, interchannel mud, interdistributary bay, subsea natural barrier and the front blanket-sand which was recognized by using the combination method of drilling core facies and well logging facies.
The main target zone of the CARACOLES area in eastern Venezuela basin is a series of delta facies sedimentation in ocean-land transitional environment. The predominant sedimentary matrix sand body in the area consists of river channel on the delta plain, underwater distributaries channel of delta front, channel mouth bar and the crevasse-splay.
The result shows that distributaries channel sand bodies were developed widely for oil and gas accumulation,and it is the main reservoir in the studied area.
In the first stage, the crevasse splays and short-lived distributary channel deposits in the subaerial delta and sheet silt in the subaqueous delta were well developed.
In the third stage, crevasse splay and short-lived distributary channel deposits mostly occurred in the lower or lower-middle part of the subaerial delta lobe, and sheet silt, accumulated off the river mouth.
Another likely indirect dike effect is decreased sinuosity in a distributary channel of the South Fork Skagit River adjacent to and downstream of the Wiley Slough dikes, compared to distributary channels upstream or distant from the dikes.
The larger southern leveed-valley system has not developed middle-fan distributary channels and appears to illustrate a period of progressive valley abandonment.
The steep continental rise and sediment "drainage" of Valencia Trough at the end of the channel-levee complexes prevent the development of distributary channels and midfan lobe deposits.
分流河道
distributary channel
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