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斜坡区是中国东部断陷湖盆的主要构造单元,是渤海湾盆地重要的油气规模增储区带。在斜坡区多年综合研究和勘探实践的基础上,提出了斜坡区(大型缓坡带)具有高、中、低分异性的新认识,即高、中、低斜坡在沉降速率、沉积相序、储层物性、生烃演化、地层压力、流体性质、油气藏类型等七方面的地质差异性,形成了断陷湖盆斜坡区优势相油气富集理论,其理论内涵为:高斜坡沟槽控砂,优势运移汇聚相富集;中斜坡坡折控砂,优势构造岩性相富集;低斜坡远扇控砂,优势源储耦合相富集。以此理论为指导,开展斜坡区精细勘探与钻探部署,斜坡区地层岩性油气藏勘探取得重要勘探成果,近5年来新增三级石油地质储量超过3×10~8t,发现了4个千万吨级效益建产区块和3个亿吨级规模增储区,证实了斜坡区优势相油气富集理论在规模效益增储及高效建产区块中的重要指导意义。
The slope area is the main tectonic unit of the faulted lake basin in eastern China and is an important oil and gas reservoir increasing zone in the Bohai Bay Basin. On the basis of many years of comprehensive research and exploration practice in the slope area, a new understanding of high, medium and low differentiation in slope area (large scale slope zone) is put forward. That is, the high, middle and low slopes are of great importance in sedimentation rate, sedimentary facies, The formation of the dominant facies oil and gas enrichment theory of the dominant facies in the slope region of the fault depression lake basin, the theoretical connotation of which is: sand control by high slope groove, The dominant migration and enrichment facies enrichment; mid-slope slope control sand, the dominant structural lithofacies enrichment; low slope remote fan-controlled sand, the dominant source-reservoir coupling enrichment. Under the guidance of this theory, fine exploration and drilling deployment in slope areas has been carried out. Exploration of stratigraphic lithologic reservoirs in sloped areas has made important exploration achievements. Over the past five years, the newly increased tertiary petroleum reserves exceeded 3 × 10 ~ 8t and 4,000 It is proved that the theory of oil and gas enrichment of dominant phase in slope area plays an important guiding role in the increase of scale benefit and efficient construction of production area.