Alluvial fan is a typical continental fan accumulation formed after the outflow of the river (flood). There are two kinds of sedimentary mechanism, the traction flow and the debris flow in the fan root area，which make the sedimentary model of alluvial fan complicated. The exposed alluvial fan phenomenon is well in Zhebu countryside, Laiyang city, Shandong province, which belongs to Cretaceous Wangshi group Xingezhuang Formation. Through the detailed observation and measurement on the section, using the sedimentary principle of the outcrop, the sedimentary environment was thought being an alluvial fan, which developed chaotic accumulation of conglomerate facies (Gms), massive bedding conglomerate facies (Gmh), trough cross bedding sandstone facies (St), planer cross bedding sandstone facies (Sp), horizontal bedding sandstones (Sh), floodplain mudstone (Fl) and massive bedding mudstone (M). The trough flow facies belt, slice flow facies belt, braid flow facies belt, runoff facies belt were identified. The facies of the trough flow belt and the slice flow facies belt were the least exposed, and the upper part of the main section was mostly debris flow deposits. The facies of the runoff facies and the braided flow facies were the most exposed, showing the characteristics of the interaction between sand and mud. In view of this, based on the study of the sedimentary characteristics of different facies zones, the sedimentary model was established and the evolution characteristics of the profile were analyzed combined with the outcrop characteristics of alluvial fan in Laiyang, Shandong province.

The Bayanhushu depression is in the initial stage of exploration, and its sedimentary characteristics and distribution are not clear. In this study, the types and characteristics of sedimentary system in Nantun Formation of Bayanhushu sag are discussed in detail by using core, well logging, seismic and grain size analysis data and combining with regional tectonic and geological background analysis. It is considered that there are 3 depositional systems of fan delta, braided river delta and lake in the study area. Braided River delta deposits and fan delta deposits are mainly developed in the gentle slope zone in the eastern part of the study area and the steep slope zone in the western part, is developed in the middle trough zone between the two.The braided river delta and fan delta deposits are mainly developed in the eastern gentle slope zon and the steep slope zone in the western part, while the lacustrine facies are developed in the middle trough zone. On the whole, the sedimentary pattern shows obvious characteristics of "North South Block and East West zoning". From the western steep slope zone to the eastern gentle slope zone, the sedimentary facies types transit from fan delta to deep lake⁃semi⁃deep lake and then gradually to the discriminate river delta. Reservoir physical properties of braided river delta front and fan delta front sand bodies are good and often adjacent to large⁃scale high⁃quality source rocks. Steep slope inversion structural reservoirs, fault⁃lithologic reservoirs and lithologic reservoirs are easy to form in steep slope zone, gentle slope zone and trough zone, respectively.

The influence of certain parameters on foam flooding in heterogeneous formations was researched using paralleled core experiment.The results show that the lowpermeability formations attribute more to the increment of oil recovery in foam flooding,while the increment of oil recovery of high permeability formations is small;Considering the oil recovery and economic benefit,the injection volume of foam is supposed to be 0.3PV~0.5PV;the permeability max-min ratio should be smaller than 15 in foam flooding,and when the permeability max-min ratio was 10,the increase amplitude of oil recovery reaches maximum.The increase amplitude raises first and then declines along with the increase of water cut,when the water cut was 80% ~90%,the oil recovery reaches maximum.The continuous injection exhibits better performance than the slugging injection and the method of alternative injection of gas and liquid between foam injecting.

The foaming behavior and its influence of an anionic sulphonate foaming agent(FA220) were researched.It was found that both of the foaming volume and half-time of foam reach the highest point when the concentration of foaming agent is 0.6%;FA220 has a good ability of resistance to Mg²⁺ ,NaCl and Ca²⁺ bring some neglect impact on the stability of foam and very little impact on the foaming volume; the addition of polymer improves the foam system stability and decreases the foaming volume,the foaming volume and half-time of foam make better result when the concentration of polymer was between 0.3~0.8g/L;oil has obvious defoaming effect,the defoaming effect become stronger with the increase of oil saturation.

The paraffin wrapt to microcapsule with urea-formaldehyde resin to resolve the compatibility issues for phase change materials was studied. The parameters affecting the coating process were investigated, including emulsifier kind, emulsifier dosage and the mechanical rotation speed. The morphology of the microcapsules varying with the acidification time was observed．Experimental results show that，when the complex emu1sifier is composed of 71% octadecanoic acid and 29% triethanolamine, the microcapsules made from 7% complex emulsifier at the rotation speed of 1 000 r/min and the acidification time for microcapsule synthesis is 90 min are of uniform particle size, smooth and wellsealed, and an average partic1e size of 29.8 μm.