Reservoir characteristics and genetic differences between the second and fourth members of Sinian Dengying Formation in northern Sichuan Basin and its surrounding areas

LI Yong; WANG Xingzhi; FENG Mingyou; ZENG Deming; XIE Shengyang; FAN Rui; WANG Liangjun; ZENG Tao; YANG Xuefei

doi:10.11698/PED.2019.01.05

2019 , Vol. 46 >Issue 1: 52 - 64

DOI: https://doi.org/10.11698/PED.2019.01.05

PETROLEUM EXPLORATION

Reservoir characteristics and genetic differences between the second and fourth members of Sinian Dengying Formation in northern Sichuan Basin and its surrounding areas

LI Yong ,
WANG Xingzhi ,
FENG Mingyou ,
ZENG Deming ,
XIE Shengyang ,
FAN Rui ,
WANG Liangjun ,
ZENG Tao ,
YANG Xuefei

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1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu 610500, China;
2. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
3. Sinopec Exploration Company, Chengdu 610041, China

Received date: 2018-08-01

Revised date: 2018-10-25

Online published: 2018-12-17

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Abstract

This study investigated the characteristics and genesis of reservoirs in the 2^nd and 4^th members of Sinian Dengying Formation in northern Sichuan and its surrounding areas, on the basis of outcrop, drilling cores and thin section observation and geochemical analysis. The reservoirs of 2^ndmember are distributed in the middle part of the stratum. The reservoir quality is controlled by supergene karst and the distribution of mound-shoal complex. The bedded elongated isolated algal framework solution-cave and the residual “grape-lace" cave, which are partially filled with multi-stage dolosparite, constituted the main reservoir space of the 2^nd member. There is no asphalt distribution in the pores. The pore connectivity is poor, and the porosity and permeability of the reservoir is relatively low. The reservoirs of 4^th member were distributed in the upper and top part of the stratum. The reservoir quality is controlled by burial dissolution and the distribution of mound-shoal complex. The bedded algal framework solution-pores or caves, intercrystalline pores and intercrystalline dissolved pores constituted the main reservoir space of the 4^th member. It’s partially filled with asphalt and quartz, without any dolosparite fillings in the pores and caves. The pore connectivity is good. Most of the 4^th member reservoirs had medium-low porosity and low permeability, and, locally, medium-high porosity and medium permeability. Affected by the development of mound-shoal complex and heterogeneous dissolution, the platform margin along Ningqiang, Guangyuan, Jiange and Langzhong is the most favorable region for reservoir development. Deep buried Dengying Formation in the guangyuan and langzhong areas should be the most important hydrocarbon target for the future exploration.

Key words： Sichuan Basin; northern Sichuan area; Sinian; Dengying Formation; mound-shoal complex; supergene karst; burial dissolution; reservoir

Cite this article

LI Yong , WANG Xingzhi , FENG Mingyou , ZENG Deming , XIE Shengyang , FAN Rui , WANG Liangjun , ZENG Tao , YANG Xuefei . Reservoir characteristics and genetic differences between the second and fourth members of Sinian Dengying Formation in northern Sichuan Basin and its surrounding areas[J]. Petroleum Exploration and Development, 2019 , 46(1) : 52 -64 . DOI: 10.11698/PED.2019.01.05

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