鄂尔多斯杭锦旗地区上古生界储层流体包裹体特征与天然气成藏时期

doi:10.11743/ogg20170509

摘要/Abstract

摘要： 杭锦旗地区是鄂尔多斯盆地天然气勘探的重点区域之一。通过杭锦旗地区流体包裹体产状特征、成分及均一温度的研究，可以确定天然气主要的成藏期次与成藏时期。研究表明，杭锦旗地区上古生界砂岩储层中的成岩流体包裹体主要分布于含砾砂岩、中细砂岩的石英加大边或愈合裂隙中，可分为两期，以气液烃包裹体、气液两相盐水包裹体为主，包裹体形态有椭圆形、次棱角形、长条形、半圆形及不规则形，气体成分主要为CO₂和CH₄。与气液烃包裹体伴生的盐水包裹体均一温度具有分布范围广、多峰值且十里加汗、新召和什股壕3个区带分布特征存在显著差异的特征；对包裹体均一温度在古地温场演化史上的投点结果和烃源岩热演化历史的综合分析表明：十里加汗区带主成藏期为始新世至今，新召区带主成藏期为始新世至今并可能存在早侏罗世晚期-晚侏罗世中期次成藏期，什股壕区带依据包裹体测温资料并结合天然气运移特征综合判断主成藏期为始新世至今。

关键词: 成藏时期, 流体包裹体, 上古生界, 杭锦旗地区, 鄂尔多斯盆地

Abstract: Hangjinqi area is one of the major gas exploration targets in Ordos Basin.Analyses of occurrence characteristics,composition and homogenization temperature of fluid inclusions from Hangjinqi area were carried out to identify the main gas reservoiring stages and timing.The results show that fluid inclusions from the Upper Paleozoic Hangjinqi area are mostly distributed in quartz overgrowth or healed fractures of pebbly sandstone,medium-grained and fine sandstones.Two stages can be identified with gas/liquid hydrocarbon inclusions and gas/liquid brine inclusions dominated.They can be oval,sub-prismatic,long strip,semicircular,and irregular in shape with carbon dioxide and methane as the dominant gas components.The homogenization temperature distribution of brine inclusions,associated with hydrocarbon inclusions,has a wide range and multiple peaks.Samples from three plays,namely the Shilijiahan,Xinzhao,and Shiguhao,in the area,show a remarkable disparity in their homogenization temperature distributions.By projecting the homogenization temperatures of the inclusions from the plays on the paleo-geothermal field evolution history of the area and analyzing the thermal evolution history of source rocks,we suggest that the primary reservoiring stage of Shilijiahan play is from the Eocene to the present.The Xinzhao play also has its primary reservoiring period from the Eocene to the present,but there is the possibility of a secondary reservoiring stage ranging from late Early Jurassic to middle Late Jurassic.The reservoiring stage in the Shiguhao play is still from the Eocene to the present based on inclusion temperature data and gas migration characters.

Key words: reservoirng stage, fluid inclusion, Upper Paleozoic, Hangjinqi area, Ordos Basin

中图分类号:

TE121.1

赵桂萍. 鄂尔多斯杭锦旗地区上古生界储层流体包裹体特征与天然气成藏时期[J]. 石油与天然气地质, 2017, 38(5): 905-912. doi: 10.11743/ogg20170509 Zhao Guiping. Characterization of fluid inclusions and timing of gas accumulation in Upper Paleozoic reservoirs of Hangjinqi area,Ordos Basin[J]. Oil & Gas Geology, 2017, 38(5): 905-912. doi: 10.11743/ogg20170509

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