摘要
利用包裹体、单井埋藏史及热演化史资料,结合边界断层分段特征,研究石臼坨凸起边界断层成藏期活动性与油气差异聚集的关系。研究结果表明:成藏期边界断层活动速率"强—弱"交替变化特征明显,整体表现为西强东弱特征。曹妃甸6-4油田古近系油藏存在3. 6～8. 5 Ma和3. 6 Ma至今2期油气充注,新近系油藏为3. 6 Ma至今一期充注成藏。成藏期断层活动速率为20～30 m/Ma时,油气在古近系相对富集;成藏期断层活动速率为30～40 m/Ma时,具有复式油气成藏特征;成藏期断层活动速率为40～60 m/Ma,断层活动对古近系古油藏具有破坏和调整作用,有利于新近系油气聚集。研究成果对于正确认识陡坡带油气成藏规律和指导类似地区油气勘探具有重要意义。
Based on the data of inclusions,burial history and thermal evolution history of single wells,combined with the segmental characteristics of boundary faults,the relationship between the activity of boundary faults in hydrocarbon accumulation stage and the differential accumulation of hydrocarbon in Shijiutuo salient was studied. The results show that the boundary fault activity rate in hydrocarbon accumulation stage is obviously characterized by "strong-weak" alternate variation,with the characteristics of strong in the west and weak in the east as a whole. In the Caofeidian 6-4 oilfield,the Paleogene reservoir was charged by hydrocarbon in two stages: 3. 6-8. 5 Ma and 3. 6 Ma-today,while the Neogene reservoir was charged by hydrocarbon in one stage: 3. 6 Ma-today. In the hydrocarbon accumulation stage,when the fault activity rate was 20-30 m/Ma,the hydrocarbon was relatively enriched in Paleogene; when the fault activity rate was 30-40 m/Ma,complex hydrocarbon accumulation characteristic existed; and when the fault activity rate was 40-60 m/Ma,the fault activity played the role of destruction and adjustment in Paleogene paleo-reservoir,which was in favor of Neogene hydrocarbon accumulation. The study achievements are of great significance for correctly understanding the hydrocarbon accumulation law in steep slope zones and guiding the oil and gas exploration in similar areas.
引文
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