1. School of Petroleum Engineering, China Univ. of Petroleum (East China), Qingdao 266580, China; Key Laboratory of Unconventional Oil & Gas Development, China Univ. of Petroleum (East China), Ministry of Education, Qingdao 266580, China; National Key Laboratory of Deep Oil and Gas, China Univ. of Petroleum (East China), Qingdao 266580, China.
2. School of Petroleum Engineering, China Univ. of Petroleum (East China), Qingdao 266580, China; Key Laboratory of Unconventional Oil & Gas Development, China Univ. of Petroleum (East China), Ministry of Education, Qingdao 266580, China; National Key Laboratory of Deep Oil and Gas, China Univ. of Petroleum (East China), Qingdao 266580, China (corresponding author).