徐深气田升深A区块营城组划分与对比

STRATIGRAPHIC DIVISION AND CORRELATION FOR YINGCHENG FORMATION IN BLOCK SHENGSHEN A OF XUSHEN GASFIELD

运用精细层序地层学理论,利用岩性、岩相、电性、物性、沉积旋回、地震反射特征等的可追踪对比性,对徐深气田升深A区块营城组进行了精细划分和对比,建立了地层格架,明确了砂体平面展布规律.研究表明：升深A区块营城组纵向上可分为营四段和营三段2段,营三段可划分为4个层,其中第1层又可划分为2个小层;营三段岩性以酸性火山喷发岩为主,为主力产气层,其中Yc3-1、Yc3-2层钻遇率高,气藏有效储层厚度较大.

By means of the theory of fine sequence stratigraphy and the traceable contrasts of the lithology, lithofa- cies, electrical and physical properties, cycle of sedimentation and characteristics of the seismic reflection, the fine division and comparison of Yingcheng-Formation in Block Shengshen A of Xushen Gasfield are conducted. And then, the stratigraphic framework is set up and the spread and distribution laws of the sandbodies in plane are made clear. The researches show that the formation sequence can be divided vertically into two members： Yc4 and Ye3. Member Yc3 is further divided into four layers, and moreover the first layer of it can be subdivided into two sublay- ers; Member Yc3 is the main gas production layer, the primary lithology is acidic eruptive voleanics, among them, the drilled and penetrated rate of Yc3-1 and Yc3-2 is the highest, and furthermore the effective gas-reservoir thick- ness is pretty larger.