Geological characteristics of the Triassic tight sandstone oil and gas reservoirs in Luoyang-Yichuan area

Du Jianbo; Tian Jingchun; Hu Junqing; Cao Jiankang

doi:10.11743/ogg20130205

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Geological characteristics of the Triassic tight sandstone oil and gas reservoirs in Luoyang-Yichuan area
Vol. 34, Issue 2, Pages: 174-178(2013)
Online First：28 April 2013，

Published：2013
DOI： 10.11743/ogg20130205
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DOI：

Du Jianbo, Tian Jingchun, Hu Junqing, et al. Geological characteristics of the Triassic tight sandstone oil and gas reservoirs in Luoyang-Yichuan area[J]. 2013, 34(2): 174-178. DOI： 10.11743/ogg20130205.

摘要

通过对洛阳-伊川地区三叠系基本石油地质条件的分析

认为三叠纪洛阳-伊川地区与鄂尔多斯盆地处于同一大型坳陷型湖盆

生储盖架构相似

烃源岩发育、厚度大、横向展布稳定、储层致密

且三叠系油气显示丰富

具致密砂岩油气藏形成的地质条件。结合对屯1井上三叠统椿树腰组工业天然气流分析

进一步明确了洛阳-伊川地区三叠系油气藏为具有低孔渗性、地层压力异常、油气呈"上油下气"倒置关系等特征的先成型致密砂岩油气藏

从而指出三叠系为洛阳-伊川地区下一步油气勘探的主攻层系

致密砂岩油气藏是该区勘探的主要方向。

Abstract

Research of the petroleum geological conditions indicates that Luoyang-Yichuan area is located in the same large depressed lacustrine basin with Ordos Basin in the Triassic.They have similar source-reservoir-caprock associations

thick and extensive source rocks

tight reservoir and active hydrocarbon shows in the Triassic.Therefore

the Luo-yang-Yichuan area has the geological conditions for accumulation of tight sand oil/gas.In combination with the analysis of industrial gas flow from the Upper Triassic Chunshuyao Formation in Well Tun 1

we believe that the Triassic reservoirs of the Luoyang-Yichuan area are pre-existing tight sandstone oil/gas reservoirs with low permeability

abnormal pressure

inverted oil-gas contact with oil in the upper and gas in the lower.The Triassic tight sandstone reservoirs are the main targets of petroleum exploration in Luoyang-Yichuan area in the future.