Analysis of main control factors and prediction of favorable exploration belts of Chang2 reservoir in Youfangzhuang area,Ordos Basin
Through the all-around analysis of the source rock distribution and evolution,structural characters,favorable facies belts,reservoir characteristics and preservation conditions of Chang2 reservoir in Youfangzhuang area,it is held that hugely thick source rock is the foundation of hydrocarbon accumulation,the thick sandstone at the junction of distributary channels is the primary position for hydrocarbon accumulation,the nose-shape uplift of high closure noses has important control effects on hydrocarbon accumulation,the high-porosity and high-permeability zones formed by large-scale dissolution are the favorable areas for hydrocarbon accumulation,and good cap rock is the important condition for hydrocarbon accumulation.Based on these researches,four favorable exploration zones are found in the studied area:Yuan122-Ding108,Wa101-Yuan106,Ding34-Ding603,Ding57-Ding48 well-blocks.