Qaidam Basin is rich in tight oil resources，with a total resource of 8.57 ×108t.In recent years，some new achievements were gained in lacustrine tight carbonate rock exploration in Yingxi area，and a massive tight oil reserve were found.In general，the structure in Yingxi area is a large-scale anticline，its structural style was characterized by “double-layer structure” in vertical.In the shallow layer，a series of fault-propagation folds were formed by detachment faults，the deeper part was characterized by the development of complex thrust structure.The sedimentary environment during the period of deposition of the upper member of Lower Ganchaigou Formation(E23)was a saline lake，the stratum was subdivided into “intra-salt” layer tracts and “below-salt” layer tracts by using the basal of salt layers as a boundary.The predominant rock types of the “below-salt” layer tracts were argillaceous rock，carbonate rock and some sulfate rock，meanwhile the good hydrocarbon source rocks were mainly developed in this interval as well.Whereas，the main rock types developed in the ‘intra-salt’ layer tracts were carbonate rock，clastic rock and halite.The main type of the source rock in the study area was dark-gray lime-mud stones，the main maceral of kerogen was Botryococcus，which had a contribution of 60% to hydrocarbon generation.The predominant rock type of reservoir was the lime-dolostone，intercrystalline pores developed widespreadly，and inter-breccia pores/caverns and dissolution pores were developed locally either.The average porosity and permeability of reservoirs was 6.2% and 0.61μm2，respectively.Based on the source-reservoir relations，the types of oil pool was subdivided into “self-generation and self-storage” type and “new source to old reservoir” type，both kinds of oil pool types were accumulated in “below-salt” layer tracts and “intra-salt” layer tracts separately.Study and exploration practices indicated that the TOC，carbonate content，porosity and brittleness of reservoirs were important ideces in sweet areas evaluation.Sweet areas were evaluated in grading，by using the multifactor superimposed method.The application of key technologies such as 3D seismic processing and interpretation，multi-stage multi-cluster fracturing in horizontal wells，and made an effective utilization of Yingxi tight carbonate oil pool.
Zhang Dao-wei, Ma Da-de, Wu Kun-yu, Wu Yan-xiong, Xia Xiao-min, Zhang Shen-qin, Zhang Xiao-qiu
. Evaluation and key technology application of tight oil sweet areas/sections in Qaidam Basin：Case of the upper member of the Lower Ganchaigou Formation in Yingxi area[J]. Natural Gas Geoscience, 2019
, 30(8)
: 1134
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DOI: 10.11764/j.issn.1672-1926.2019.06.010
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