CO_2驱油后的矿物捕获——以松辽盆地南部为例

Mineral capture after CO_2 drive:Taking south of Songliao Basin as an example

CO2是形成温室效应、导致全球气候变暖的主要气体。利用CO2驱油并将CO2封存于油藏中,成为降低大气中CO2含量的一种有效方法。文中通过研究松辽盆地南部油藏中含片钠铝石砂岩的成岩共生序列和流体包裹体特征,尝试探讨CO2驱油后矿物捕获的可能性。研究表明:含片钠铝石砂岩岩性为细中粒长石岩屑砂岩和岩屑长石砂岩;其成岩共生序列和包裹体特征显示,含片钠铝石砂岩记录了研究区油气注入、构造调整和天然CO2充注驱油3种地质现象,其中,片钠铝石、方解石和铁白云石等形成于CO2充注驱油后的固碳矿物,进一步证明利用CO2驱油并进行地质封存的方案是可行的。

The CO2 arising from the burning of fossil fuels are the mainly warming gases leading the greenhouse effect. The CO2-EOR project in the oilfield has become an effective way to reduce CO2 in the atmosphere. The association succession of authigenetic mineral and the character of fluid inclusion of dawsonite-bearing sandstones have been studied to explore the possibility of mineral capture after CO2 drive. Study shows that the dawsonite-bearing sandstones are fine grain feldspathic litharenite and lithic arkose.The diagenetic association succession and fluid inclusions characters show that oil infilling, structure adjustment and natural CO2 filling are recorded in the dawsonite-bearing sandstones. The dawsonite, calcite and dolomite form in carbon sequestration mineral after natural CO2 oil infilling and drive, which further proves that the scheme using CO2 drive and geological sequestration is feasible.