Quantitative analysis of pore evolution and its application to basin simulation: A case from Chang 8 reservoir in Heshui Area, Ordos Basin, NW China
- Journal of Northwest University (Natural Science Edition) Vol. 53, Issue 5, Pages: 843-856(2023)
- 作者机构：
1.咸阳师范学院 地理与环境学院，陕西 咸阳 712000
2.江西省数字国土重点实验室，江西 南昌 330013
3.低渗透油气田勘探开发国家工程实验室，陕西 西安 710018
4.中国石油长庆油田分公司勘探开发研究院，陕西 西安 710018
5.东华理工大学 地球科学学院，江西 南昌 330013
- 作者简介：
- 基金信息：
DOI：10.16152/j.cnki.xdxbzr.2023-05-016
CLC：
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SHANG Ting, WANG Bin, YANG Qingkun, et al. Quantitative analysis of pore evolution and its application to basin simulation: A case from Chang 8 reservoir in Heshui Area, Ordos Basin, NW China. [J]. Journal of Northwest University (Natural Science Edition) 53(5):843-856(2023)
SHANG Ting, WANG Bin, YANG Qingkun, et al. Quantitative analysis of pore evolution and its application to basin simulation: A case from Chang 8 reservoir in Heshui Area, Ordos Basin, NW China. [J]. Journal of Northwest University (Natural Science Edition) 53(5):843-856(2023) DOI： 10.16152/j.cnki.xdxbzr.2023-05-016.
摘要
以鄂尔多斯盆地合水地区三叠系延长组长8段为研究对象，通过岩心观察和薄片鉴定分析，结合物性分析等方法，对研究区的岩石学特征、物性特征、成岩作用和成岩序列进行系统研究，并进一步对储层孔隙演化进行定量分析，最后利用定量的孔隙演化结果进行油气运聚模拟恢复。研究表明，研究区储层岩性为粉砂岩夹泥岩或泥质粉砂岩，具有典型的低孔、低渗特征；在成岩作用特征和成岩史研究的基础上，依据大量的统计资料，并以现今孔隙度作为约束条件，定量恢复出了成岩期的孔隙演化过程，综合所得的孔隙演化的定量模拟结果与实际地质情况较为吻合；利用定量化的孔隙演化结果，运用PetroMod软件进行油气运聚模拟恢复，得出盆地石油充注开始于晚侏罗世(J,3,)末期，生排烃和聚集量均达到峰值出现于早白垩世(K,1,)末期，到白垩世末期时仍具有较高的聚集量，聚集量显著减少为现今阶段。同时，将该研究模型与实际钻探成果相叠加，对模拟结果进行检验，结果合理，可将其推广应用到同类型其他油田中，对进一步勘探开发提供一定借鉴。
Abstract
Taking the Chang 8 Member of Upper Triassic Yanchang Formation in Heshui Area of Ordos Basin as the research object, the petrological, porosity, permeability characteristics, diagenesis and diagenetic sequence were researched; through core observation and thin section identification, combined with physical properties analysis and other methods. Furthermore, the quantitative analysis of reservoir pore evolution was carried out. Finally, the quantitative pore evolution results were used to simulate the recovery of hydrocarbon migration and accumulation. The result shows that the lithology of reservoir in the study area was siltstone with mudstone or argillaceous siltstone, which has typical characteristics of low porosity and low permeability. Based on the study of diagenetic characteristics and diagenetic history, and taking the present porosity as the constraint condition, the pore evolution process of diagenetic period was quantitatively recovered, the quantitative simulation results of pore evolution in diagenetic period were consistent with the actual geological situation. Using the quantified pore evolution results, PetroMod software was used to simulate the recovery of hydrocarbon migration. The results show that the oil charging in the basin began at the end of Late jurassic (J,3,), the peak of hydrocarbon generation and expulsion and accumulation appeared at the end of Early cretaceous (K,1,), to the late cretaceous which still had high aggregation, and the accumulation was significantly reduced to the present stage. Meanwhile, the model is superimposed with the actual drilling results to test the simulation results. The results proved reasonable, and it can be applied to other oilfields of the same type, providing some reference for further exploration and development.
关键词
鄂尔多斯盆地合水地区成岩作用孔隙演化盆地模拟
Keywords
Ordos BasinHeshui Areadiagenesispore evolutionbasin modeling
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