鄂爾多斯盆地周家灣長(zhǎng)6和長(zhǎng)8油層組成藏控制因素
[Abstract]:This paper discusses the main factors and model of reservoir formation in Yanchang formation of Triassic in Zhoujiawan area of Ordos Basin. The differences of hydrocarbon generation and expulsion from source rocks of Chang7 source rocks affecting oil migration and accumulation as well as the deposition and diagenesis of Chang 6 and Chang 8 are studied and the difference of reservoir formation is summarized. The results show that the source rocks with large area distribution in Chang7 provide the material foundation and migration power for the reservoir formation, and the Chang 6, Chang 8 connective sandbodies and structural fractures in this area provide the conditions of migration and transportation. The large scale superimposed sand bodies Chang 6 and Chang 8 formed a good reservoir mass, and the relatively high porosity and high permeability reservoirs developed by sedimentary and diagenetic differences controlled the distribution of reservoir rich areas. The model of Chang 6 reservoir formation shows that Chang 7 oil source first moves upward to Chang 6 reservoir, then lateral migration and accumulation along the connected sand body, until it extends far away from Chang 7 source rock distribution area and forms a large area distribution reservoir along the north to east direction sand body; The Chang 8 reservoir formation model is mainly composed of Chang 7 source rock migration and accumulation, less secondary lateral migration and smaller reservoir area.
【作者單位】: 中國石油長(zhǎng)慶油田分公司勘探開發(fā)研究院;低滲透油氣田勘探開發(fā)國家工程實(shí)驗(yàn)室;
【基金】:國家自然科學(xué)基金重大項(xiàng)目(41390451) “十三五”國家油氣重大專項(xiàng)(2016ZX05046) 國家“973”項(xiàng)目(2014CB239003)
【分類號(hào)】:P618.13
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