Paleogene lowstand system tract deposits and nonstructural traps in dongying sag 东营凹陷下第三系低位域沉积及非构造圈闭
The reservoir is located at yishan slope area between jinxi fold belt and tianhuan depression , it has the characters of less structural deformation , overlying hydrocarbon genetic center in upper and lower palaeozoic era , growth of high efficient reservoirs and as well as fast lateral changes of reservoir physical properties , it has the condition of forming non structural traps , which is the major area for gas reservoir exploration in the basin 位于晋西挠褶带和天环坳陷间的伊陕斜坡区,因具有构造变形微弱,上、下古生界生烃中心叠置,高效储层发育,储集层物性侧向变化快等特点,具备形成非构造圈闭优越条件,为盆地气藏勘探约重点区带。
( 4 ) the formation and growth of structural traps and stratigraphic - unconformity traps in the area is controlled by three compressive stages of silurian - devonian , late permian - tertiary and oligocene - quaternary ; non - structural and compound traps mainly grew in the early paleozoic . structural traps mostly grew in the late paleozoic and the cenozoic and mostly grew on the north and south belts ; non - structural traps mostly grew in the northern area of the hetian concave . most traps in the area formed or typed at last in the himalayan episode , dispersed on the north and south belts ( 4 )研究区构造与地层不整合圈闭的形成和发育受志留-泥盆纪、晚二叠世-第三纪、渐新世-第四纪三个挤压阶段的控制;早古生代主要发育非构造圈闭和复合圈闭,晚古生代和新生代则主要发育构造圈闭:构造圈闭主要发育在南北两带上,其次为中带;非构造圈闭主要发育在和田凹陷以北的地区;研究区内大多数圈闭是喜山期形成或最终定型的,在南北两带都有分布,而海西期圈闭主要分布于研究区中带玛南构造带处。
With the exploration degree improved gradually in oil fields , it becomes more and more difficult to add and find new structure trap , and the traditional theories of exploration becomes no use . as a new theory and method , the sequence stratigraphy has shown its advantages in search of subtle traps 随着油田勘探成熟度的不断提高,增加和发现新的构造圈闭已经变得越加困难,传统的勘探理论已经显得无能为力,层序地层学作为一种新理论、新方法,已日益显露出其寻找非构造圈闭的优势。