| The MaoJiahe wellblock locates in Zichang county, chang4+5and6petroleum reservoirwas discovered by oil-gas exploring in this area. Ordos basin Mesozoic oil and gas explorationpractice shows that chang4+5and6reservoir mostly for lithologic reservoir, the distributionof oil and gas controlled by sedimentation. This paper presents layer division by using sample,drilling geology and logging data. Taking layer structure, sedimentary facies, reservoirfracture and other geological characteristics in Maojiahe area as the research background,some conclusions are drawn, namely, this area is delta plain facies, most fractures strike inchang6reservoir are north-east, and the dip angle is40～75°. Reservoir evaluation revealsthat Maojiahe reservoir has many characteristic,such as extra low to low permeability, weakvelocity sensitive, weak salt sensitivity, medium water sensitivity, medium acid sensitive,medium weak stress sensitivity. This study may lay the good foundation for exploration anddevelopment in this area. |
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