石臼坨凸起东段围区沙一二段古物源恢复及其对储层的控制

物源区原始剥蚀地貌的恢复以及与砂体、优质储层之间的关系是源－汇系统分析中非常重要的部分.利用钻井、三维地震以及分析化验等资料，恢复了石臼坨凸起东段围区沙一二段储层的古物源分布，并探讨了古物源对储层的影响.结果表明:（1）研究区沙一二段发育近源扇三角洲砂砾岩储层，东部古物源的母岩类型为白垩系中酸性火成岩，西部古物源的母岩类型为中生界碎屑岩夹薄层中酸性火成岩，均非现今残留的基岩分布.（2）受母岩差异的影响，东部火成岩的母岩剥蚀后更容易形成规模较大的砂砾岩体.（3）受物源区母岩和沉积区储层成岩作用差异的共同影响，东部储层中中酸性火成岩岩屑和砾石等易溶组分含量高，粒度较粗，以碳酸盐胶结为主，在成岩过程中，中酸性火成岩砾石、岩屑易遭受强烈溶蚀作用，次生孔隙发育，但受碳酸盐矿物进一步强烈的胶结，储层物性呈低孔低渗特点；西部储层中变质岩岩屑和石英等难溶组分含量高，填隙物以粘土类为主，原生孔隙发育，储层物性呈中高孔高渗的特点. 

Restoration of the Paleo-Provenance of the Es12 in the Eastern of Shijiutuo Uplift and Its Control on Reservoir

The restoration of the original eroded landforms of the source area and its association with sand bodies and high quality reservoirs are very important parts of the Source-to-Sink system analysis.Based on the drilling data, 3-D seismic data and other experimental analysis, the distribution of the paleo-provenance of the reservoirs of the Es₁₂ in the eastern of Shijiutuo uplift was restoredin this study, using statistical method. The paleo-provenance's control on the reservoir was discussed as well. The results suggest:(1) The near-source fan-delta sandstone and conglomerate reservoirs in the study area received sediments. The parent rocks of the paleo-provenance in the eastern sub-uplift were Cretaceous acidic igneous rocks while the parent rocks of the paleo-provenance in western sub-uplift were Mesozoic clastic rocks with thin interlayers of intermediate-acidic igneous rocks, which were totally different from the residual bedrock. (2) Due to differences of the mother rock, the igneous rocks of the eastern sub-uplift were more likely to be eroded and formed large-scale sandstone and conglomerate. (3) The reservoir physical properties of the study area were affected by the source rock lithology and reservoir diagenesis. The eastern reservoirs were characterized by high content of the acid igneous rocks, gravels and other soluble components and coarse grain size. The interstitial substance was carbonate cements. In the process of diagenesis, the intermediate-acid igneous rocks and gravels were susceptible to the strong dissolution of organic acids, leading to the development of secondary pores. However, the reservoir featured low porosity and low permeability due to the further cementing of strong carbonate minerals. The western reservoirs were characterized by high content of refractory components such as metamorphic rocks and quartz, with clay as the interstitial substance. The primary porosity was preserved to be the dominant porosity, the reservoir featured medium-high porosity and high permeability.The results of this study are useful for sandstone and conglomerate reservoir prediction.