摘要
对沈232—沈238井区沙三、沙四段地层沉积特征和划分对比标志进行研究,建立了地层格架。地层沉积特征反映该区经历了水进—水退的沉积过程,形成了一套以扇三角洲相向河流三角洲相过渡的砂岩和含砾砂岩沉积体系。圈闭类型有构造-断层圈闭和断层-岩性圈闭;储层类型属低孔低渗砂岩和砂砾岩;此外,沙四段还有特殊的产层类型———油页岩。该区烃源岩好,且有一定的储层发育,测试获工业油流,通过进一步滚动勘探开发,有望获得新的地质储量。
Depositional characteristics and correlation marker in s_3+s_4 formation in Shen232-Shen238 wellblock of Damintun Sag are studied,and formation framework is established.The depositional characteristics indicate the formation had undergone progressive-regressive cycle,thus formed a depositional system of sandstone and conglomeratic sandstone transiting from fan-delta to fluvial-delta facies.There are two types of oil traps: one is structure-fault trap,the other is fault-lithology trap.The reservoirs are low porosity and low permeability sandstone and conglomeratic sandstone reservoirs.Moreover,s_4 formation also contains a special reservoir type—oil shale.This area had good source rock and had developed certain reservoirs.Commercial oil flow has been obtained,and it is hopeful to discover new OOIP through progressive exploration and development.
出处
《特种油气藏》
CAS
CSCD
2005年第6期14-17,共4页
Special Oil & Gas Reservoirs
关键词
地层划分对比
储层分布
潜力评价
大民屯凹陷
沈232-沈238井区
formation division and correlation
reservoir distribution
potential evaluation
Damintun Sag
Shen232-Shen238 wellblock
