四川盆地侏罗系页岩层系岩相类型及储集特征

doi:10.11743/ogg20220510

Abstract

Abstract:

The continental shale strata are generally lithologically complicated and highly heterogeneous， making it difficult to pinpoint sweet spots and deploy exploratory wells. To evaluate the reservoir characteristics and gas-bearing capacity of different lithofacies types of Jurassic shale sequences in the Sichuan Basin， the Da’anzhai Member （Well Y2） in the Yuanba area was taken as an example. Experimental methods including TOC content measurement， whole-rock mineral composition analysis， thin section observation， FIB-SEM， mercury injection-N₂adsorption measurements as well as tests for physical properties were performed to classify the lithofacies types of shale and interlayers in the second sub-member of the Da'anzhai Formation （hereinafter referred to as the J₁da²） and then to single out the lithofacies or lithofacies assemblages with the highest hydrocarbon potential based on physical properties， pore structure， gas content and occurrence as well as fracability. Results show that the shale can be divided into three categories and six sub-categories of lithofacies types， and the interlayers into two categories and six sub-categories for lithofacies types， which can be further grouped into three lithofacies assemblage types from a macro perspective. The shale contains mostly inorganic pores such as interlayer pores within clay minerals and dissolved pores of calcite， providing storage space for gas. The total shale gas content is calculated to be 2.59-4.38 m³/t， in which the free gas accounts for an average of 67 %， indicating a good exploration potential. However， the brittle mineral content of shale lithofacies is barely 50 %， indicating a poor fracability. It is concluded that type AB-Ⅰ lithographic assemblages in the sub-member are the most promising exploration targets as they are observed to contain well developed cleavage and lamellation fractures， favorable hydrocarbon generation conditions， higher gas content and proportion of free gas as well as brittle interlayers， all indicating the most promising exploration targets of all types.

Key words: lithofacies, interlayer, shale, Da’anzhai Member, Jurassic, Yuanba area, Sichuan Basin

CLC Number:

TE122.2

Qianwen Li, Zhongbao Liu, Feiran Chen, Guangxiang Liu, Dianwei Zhang, Peng Li, Pengwei Wang. Lithofacies types and reservoir characteristics of Jurassic shale in the Sichuan Basin revealed by the Da’anzhai Member， Well Y2， Yuanba area[J]. Oil & Gas Geology, 2022, 43(5): 1127-1140.

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取样深度/m	岩相类型	TOC/%	主要矿物含量/%	矿物结构与沉积构造
3 909.44	中-高碳粘土质页岩相（A₁型）	2.16	粘土矿物：50.0 石英+长石：41.2 碳酸盐矿物：6.9	灰黑色，泥质结构为主，页理发育，少许条带富集，黑色矿物呈斑点状、弯曲短细条状密集分布
3 914.03	低-中碳粘土质页岩相（A₂型）	0.68	粘土矿物：55.8 石英+长石：6.6 碳酸盐矿物：0.7	深灰色，泥质结构为主，针状白云母定向分布其中，碎屑颗粒以粉砂为主，不均匀分布介壳类颗粒
3 885.00	中碳含介壳页岩相（B₁型）	1.56	粘土矿物：48.9 石英+长石：44.4 碳酸盐矿物：1.2	灰黑色，以粘土矿物为主，局部浸染黑色有机质，零星分布少许介壳状、拉长状等颗粒，主要由方解石组成
3 888.74	低-中碳介壳灰质页岩相（B₂型）	1.06	粘土矿物：44.4 石英+长石：40.7 碳酸盐矿物：11.2	深灰色，以粘土矿物为主，偶见黑色有机质呈团粒状零星分布，不均匀分布似腕足状、介壳状颗粒，长轴定向明显
3 901.54	低-中碳含灰质介壳页岩相（B₃型）	0.98	粘土矿物：47.3 石英+长石：47.1 碳酸盐矿物：3.1	深灰色，主要成分为粘土矿物，零星分布似介壳、腕足颗粒，部分颗粒边缘环绕分布碎屑颗粒
3 907.44	低-中碳粉砂质页岩相（C₁型）	1.18	粘土矿物：46.9 石英+长石：45.4 碳酸盐矿物：6.0	深灰色，主要成分为粘土矿物，黑色矿物不均匀分布，可能为炭屑，碎屑颗粒以粉砂为主，不均匀星散分布

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Lithofacies types and reservoir characteristics of Jurassic shale in the Sichuan Basin revealed by the Da’anzhai Member， Well Y2， Yuanba area

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