收稿日期: 2011-10-13
修回日期: 2012-05-23
网络出版日期: 2012-08-10
基金资助
国家重点基础研究发展计划（“973”）项目(编号：2007CB209502)资助.
Control Factors of Favorable Reservoir of T3x2 Section and Gas-bearing Condition in Tongnan Area,Sichuan Basin
Received date: 2011-10-13
Revised date: 2012-05-23
Online published: 2012-08-10
四川盆地潼南地区位于川中南部平缓构造带，该区须家河组须二段储层具有孔隙度低、渗透率低、非均质性强以及含水饱和度高的特点。寻找具有相对高孔隙度和高渗透率的有利储层对于气藏的有效开发具有重要的意义。通过薄片观察、沉积相和储层精细分析认为，有利储层的发育受主河道发育带、早印支期古地貌、层序界面以及泥岩发育带的控制。主河道发育带砂体粒度粗，结构和成分成熟度较高，原生孔隙发育；下伏早印支期古地貌的起伏，导致须二下亚段在地形高部位和斜坡带形成高能河道，所沉积砂岩孔隙和渗透性发育，而须二上亚段沉积时地形平缓，水动力较弱，砂岩粒度细，物性较差；湖泛面上下的泥岩发育带在深埋受热过程中形成的酸性水溶液，有利于其附近的砂岩溶蚀孔隙形成。利用阵列感应测井和核磁共振实验，较为精确地计算了研究区的束缚水饱和度和可动水饱和度，据此将须二段储层划分为气层、气水同层和水层。储层含气性主要受物性、沉积相和构造起伏的控制，含气性较好的区域基本分布在须二上亚段和须二下亚段上部河道叠置带储层的构造高部位地区。
卞从胜，汪泽成，王红军,徐安娜，徐兆辉，郝国丽 . 四川盆地潼南地区须二段有利储层控制因素及含气性[J]. 天然气地球科学, 2012 , 23(4) : 681 -690 . DOI: 10.11764/j.issn.1672-1926.2012.04.681
Tongnan area is located in the gentle structure of central Sichuan basin.T3x2 reservoirs in the Tongnan area are characterized as low porosity,low permeability,high heterogeneity,and high water saturation.The discovery of favorite reservoirs with relative high porosity and permeability is important to gas reservoir development.In this paper,we find out that the formation of favorite sandstone reservoirs is controlled by main channel sand,Indo-Chinese Epoch paleogeomorphology and sequence boundaries by means of thin sections observed,sedimentary faces and reservoirs fine analysis.Sandstones formed in main channel zone bear coarse size,high maturity of texture and composition as well as primary pores.The fluctuation of paleogeomorphology underlay Leikoupo Formation caused the formation of high-energy channel in highland and slope of lower T3x2 subsection.The sedimentary sandstones have high porosity and permeability.During process of burying and heating,the mudstones early formed in the lake flooding surface may generate acidic water,which may be helpful for the formation of dissolution porosity.We use the array induction imaging log and nuclear magnetic resonance experiment to calculate the irreducible and movable water,and then divide the reservoirs of T3x2 section into gas layer,gas-water layer and water layer.The gas-bearing condition is controlled by physical property,sedimentary facies and tectonic fluctuation.The movable water saturation has positive relation with physical properties.Gas is mainly accumulated on the highland of channel lapping zone,upper sub-member,and top of lower T3x2.
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