Evaluation Researching Of Special Reservoir At Oulituozi Area Of Eastern Sag, Liaohe Basin

With the continually development of petroleum and gas field,the igneous rock reservoir had become important explore aim in the world. Eastern sag has the fewest exploration work of three sags in Liaohe basin and Oulituozi area is an important exploration and development area of igneous rock reservoir in recent years. Complex lithology, widely changed stratum thickness, it is difficult to compare between igneous rock and sedimentary stratum. Igneous lithofacies change quickly in landscape orientation, reservoir forecast is difficult, it determine the exploration aim which kinds of method for evaluating igneous reservoir and analysis contact relationship of igneous and sedimentary stratum should be chosen.Volcanism and sedimentary function should be acted as one checks and balances sedimentary system. because dense coal was found everywhere in upper Shahejie formation which was isochronous and planation surface, Stratum model can be built by taking igneous rock interlayer in sedimentary rock as hinge, recovering isochronous relationship between sedimentary function in trough-belt and volcanism in high-mesa-belt, using cyclic comparison and grading controlling method, structure researching was based on seismic explain result ,drilling well and developments information, it should be coordinated with Huangshatuo and Rehetai tectonic units. Trachyte's surface shape and thickness, structure and macro-distributing of igneous breccias can be used to research igneous rock reservoir. Igneous rock reservoir can be evaluated by using geological, geophysical and assaying material.Igneous stratum can be divided into three belts, from east to west it lays igneous rock belt, transition rock belt and sedimentary rock belt, from lower to upper it lays tuff belt, trachyte belt and basalt belt. As growthing rate gap is great that between volcanism and sedimentary function, the stratum thickness looks like seesaw model. Regional tectonic stress field controls tectonic evolvement, northeast direction fault began to emerge on the background of sinistral wrench fault during former-tertiary, after Regional tectonic stress field convert into dextral wrench fault, it converts into tension deep fracture during medium-term tertiary, as induces massive volcanic eruption. Normal fault converted into reverse fault with the compressive stress come into bring during terminal Dongying formation period. Igneous rock reservoir composed by crack and pore can be recognized effectively by using 3700 and 5700 logging, which has intensity heterogeneity character. Tectonic condition is the key factor for igneous rock reservoir, which produce crack and improve reservoir character, abundant generating rock is the foundation for igneous rock reservoir, lithology condition is the important supplement for igneous rock reservoir, it is easy for trachyte to produce crack. Volcanism and sedimentary function acted as one checks and balances sedimentary system with interpenetration character, which composed sedimentary system. According to the research results, 1719×104t had been found, and turbidity fan will be latest exploration aim.